Gr 10 Physical Sciences Ch 12 SUM: Electrostatics
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Questions and Answers

What is the condition when an object has equal amounts of positive and negative charge?

  • Electrically charged
  • Electrically neutral (correct)
  • Negatively charged
  • Tribo-electrically charged

    • What is the net charge of an object with 8 positive charges and 6 negative charges?

  • -2
  • +2 (correct)
  • -1
  • +1

    • What carries negative charges?

  • Electrons (correct)
  • Atoms
  • Neutrons
  • Protons

    • What happens to the number of electrons when an object becomes positively charged?

    <p>Electrons are removed</p> Signup and view all the answers

    What is tribo-electric charging?

    <p>A process of transferring charge through contact or friction</p> Signup and view all the answers

    What happens to the cloth when you rub it against a plastic ruler?

    <p>The cloth becomes positively charged</p> Signup and view all the answers

    What determines the arrangement of materials in a tribo-electric series?

    <p>Their tendency to gain or lose electrons</p> Signup and view all the answers

    What happens to the amber when wool is rubbed against it?

    <p>The amber becomes negatively charged</p> Signup and view all the answers

    What is the term for the force exerted by static charges on each other?

    <p>Electrostatic force</p> Signup and view all the answers

    Which of the following charges attract each other?

    <p>Opposite charges</p> Signup and view all the answers

    What is the principle that states that charge is neither created nor destroyed?

    <p>Conservation of charge</p> Signup and view all the answers

    What is the characteristic of materials that allow electrons to move freely?

    <p>Conduction</p> Signup and view all the answers

    What happens to excess charge on a conductor?

    <p>It spreads out uniformly over the surface</p> Signup and view all the answers

    What is the result of bringing two identical conducting spheres into contact?

    <p>The charge is equally distributed between the two spheres</p> Signup and view all the answers

    What is the term for the transfer of electrons between materials through contact or rubbing?

    <p>Tribo-electric charging</p> Signup and view all the answers

    What is the characteristic of materials that do not allow electrons to move freely?

    <p>Insulation</p> Signup and view all the answers

    What is the result of placing an excess charge on an insulator?

    <p>The charge remains concentrated at the point of contact</p> Signup and view all the answers

    What is the significance of sharp points on conductors?

    <p>They cause charge to leak off</p> Signup and view all the answers

    What is the purpose of a lightning rod on a building?

    <p>To reduce the risk of a lightning strike</p> Signup and view all the answers

    What is the unit of charge carried by a single electron?

    <p>1.6 × 10^(-19) C</p> Signup and view all the answers

    What is the principle of charge quantisation?

    <p>Any charge in the universe is an integer multiple of the elementary charge</p> Signup and view all the answers

    What happens when a charged object is brought close to a neutral insulator?

    <p>The insulator becomes polarised</p> Signup and view all the answers

    What is the characteristic of conductors that enables them to distribute charge evenly over their surfaces?

    <p>Electrons can move freely through the material</p> Signup and view all the answers

    What happens when two conductors touch?

    <p>They share the total charge between them</p> Signup and view all the answers

    What is the characteristic of insulators that prevents the even distribution of charge?

    <p>Electrons are bound to the atoms</p> Signup and view all the answers

    What is the experiment that measured the charge of an electron?

    <p>Millikan's oil drop experiment</p> Signup and view all the answers

    What is the phenomenon that occurs when a charged object is brought close to a neutral insulator?

    <p>Polarisation</p> Signup and view all the answers

    What is the shape of a conductor that enables the even distribution of charge?

    <p>Spherical</p> Signup and view all the answers

    What happens when two like charges are brought close together?

    <p>They repel each other</p> Signup and view all the answers

    What is the strength of the electrostatic force proportional to?

    <p>The inverse of the distance between the charges</p> Signup and view all the answers

    What happens when a glass rod is rubbed with silk?

    <p>The glass rod becomes positively charged</p> Signup and view all the answers

    What is the result of bringing two rods with opposite charges close together?

    <p>They attract each other</p> Signup and view all the answers

    What is the purpose of rubbing a glass rod with silk in an experiment?

    <p>To make the glass rod positively charged</p> Signup and view all the answers

    What is the characteristic of water molecules that allows them to be attracted to a charged object?

    <p>They are polarized</p> Signup and view all the answers

    What happens when a charged rod is brought close to a stream of water?

    <p>The stream of water is attracted to the rod</p> Signup and view all the answers

    What is the result of rubbing a plastic rod with fur?

    <p>The plastic rod becomes negatively charged</p> Signup and view all the answers

    What happens when an object has a net positive charge?

    <p>It has more positive charges than negative charges</p> Signup and view all the answers

    What is the purpose of tribo-electric charging?

    <p>To alter the overall charge of an object</p> Signup and view all the answers

    What determines the type of charge an object acquires through tribo-electric charging?

    <p>The material's position in the tribo-electric series</p> Signup and view all the answers

    Why does an object become positively charged when electrons are removed?

    <p>Because the object becomes electron-deficient</p> Signup and view all the answers

    What is the result of rubbing a cotton cloth against a plastic ruler?

    <p>The ruler becomes positively charged and the cloth becomes negatively charged</p> Signup and view all the answers

    What happens when an object has a net negative charge?

    <p>It has more negative charges than positive charges</p> Signup and view all the answers

    Why do materials in a tribo-electric series tend to gain or lose electrons?

    <p>Because of their position in the tribo-electric series</p> Signup and view all the answers

    What is the result of transferring negative charge to an object?

    <p>The object becomes negatively charged</p> Signup and view all the answers

    What is the primary factor that determines the strength of the electrostatic force between two charges?

    <p>The distance between the charges</p> Signup and view all the answers

    Which of the following statements is true about the conservation of charge?

    <p>Charge is neither created nor destroyed</p> Signup and view all the answers

    What happens to the charge on a conductor when it is brought into contact with a neutral object?

    <p>The charge is evenly distributed across the surface of the conductor</p> Signup and view all the answers

    Why do sharp points on conductors cause charge to leak off?

    <p>Because the charge is concentrated at the points</p> Signup and view all the answers

    What is the characteristic of conductors that allows them to distribute charge evenly over their surfaces?

    <p>The electrons are free to move</p> Signup and view all the answers

    What happens when two identical conducting spheres come into contact and share their charge?

    <p>The charge is evenly distributed between the two spheres</p> Signup and view all the answers

    Why do insulators prevent the even distribution of charge?

    <p>Because the electrons are bound tightly to the atoms</p> Signup and view all the answers

    What is the result of the electrostatic force between two like charges?

    <p>Repulsion</p> Signup and view all the answers

    What is the significance of the electrostatic force in everyday life?

    <p>It is crucial in understanding electrical interactions at the microscopic and macroscopic levels</p> Signup and view all the answers

    What is the primary reason for the distribution of charge on a spherical conductor?

    <p>The repulsive forces between like charges</p> Signup and view all the answers

    What happens to the charge on a conductor when it is placed on a sharp point?

    <p>The charge leaks off the conductor.</p> Signup and view all the answers

    What is the minimum amount of charge that can exist on an object?

    <p>1 elementary charge</p> Signup and view all the answers

    Why do insulators not allow electrons to move freely?

    <p>Because the electrons are bound to the atoms.</p> Signup and view all the answers

    What is the result of polarisation in a neutral insulator?

    <p>The insulator remains electrically neutral.</p> Signup and view all the answers

    What is the purpose of a lightning rod on a building?

    <p>To channel away excess charge and reduce the risk of a lightning strike.</p> Signup and view all the answers

    Why do identical conductors share the total charge between them when they touch?

    <p>Because the electrons are able to move freely between the conductors.</p> Signup and view all the answers

    What is the characteristic of materials that are naturally polarised?

    <p>They have distinct positive and negative sides.</p> Signup and view all the answers

    What is the result of placing an excess charge on an insulator?

    <p>The charge is concentrated at the point where it was deposited.</p> Signup and view all the answers

    What is the significance of the experiment known as Millikan's oil drop experiment?

    <p>It measured the charge of an electron.</p> Signup and view all the answers

    What is the phenomenon that occurs when a charged object is brought close to a neutral insulator?

    <p>Polarisation.</p> Signup and view all the answers

    What happens when two glass rods, both rubbed with silk, are brought close together?

    <p>They repel each other.</p> Signup and view all the answers

    What is the direction of the electrostatic force between two opposite charges?

    <p>It is attractive.</p> Signup and view all the answers

    What happens to the strength of the electrostatic force as the distance between the charges increases?

    <p>It decreases.</p> Signup and view all the answers

    What is the characteristic of water molecules that allows them to be attracted to a charged object?

    <p>They are dipolar.</p> Signup and view all the answers

    What happens when a positively charged rod is brought close to a stream of water?

    <p>The water molecules align with their negative sides towards the rod.</p> Signup and view all the answers

    What is the purpose of the experiment involving rubbing a glass rod with silk and then bringing a plastic rod rubbed with fur close to it?

    <p>To demonstrate the attraction between opposite charges.</p> Signup and view all the answers

    What is the result of bringing two identical charged rods close together?

    <p>They repel each other.</p> Signup and view all the answers

    What is the relationship between the strength of the electrostatic force and the distance between the charges?

    <p>The force is inversely proportional to the square of the distance.</p> Signup and view all the answers

    What is the net charge of an object with 6 positive charges and 9 negative charges?

    <p>-3</p> Signup and view all the answers

    What happens to an object when it gains electrons?

    <p>It becomes negatively charged</p> Signup and view all the answers

    What is the purpose of the tribo-electric series?

    <p>To arrange materials based on their tendency to gain or lose electrons</p> Signup and view all the answers

    What happens to the negative charge when a cotton cloth is rubbed against a plastic ruler?

    <p>It is transferred to the ruler</p> Signup and view all the answers

    Why do objects become electrically charged when there is an imbalance of positive and negative charges?

    <p>Because one type of charge is in excess of the other</p> Signup and view all the answers

    What determines the type of charge an object acquires through tribo-electric charging?

    <p>The material it comes into contact with</p> Signup and view all the answers

    What is the result of having an equal number of positive and negative charges on an object?

    <p>The object remains neutral</p> Signup and view all the answers

    What happens when an object is electron-deficient?

    <p>It becomes positively charged</p> Signup and view all the answers

    What is the primary reason why like charges repel each other?

    <p>Because they are trying to move away from each other's electric field</p> Signup and view all the answers

    What is the significance of the distance between charges in the electrostatic force?

    <p>The force is inversely proportional to the distance</p> Signup and view all the answers

    What is the characteristic of water molecules that allows them to be attracted to a charged object?

    <p>They are polarized, having distinct positive and negative regions</p> Signup and view all the answers

    What happens when two rods with opposite charges are brought close together?

    <p>They attract each other</p> Signup and view all the answers

    What is the purpose of rubbing a glass rod with silk in an experiment?

    <p>To create a static electric charge on the glass rod</p> Signup and view all the answers

    What is the result of bringing a positively charged rod close to a stream of water?

    <p>The water molecules align with their negative sides towards the rod</p> Signup and view all the answers

    What happens when a negatively charged rod is brought close to a neutral insulator?

    <p>The insulator remains neutral</p> Signup and view all the answers

    What is the underlying principle behind the attraction and repulsion between charges?

    <p>The conservation of charge</p> Signup and view all the answers

    Which of the following is a characteristic of electrostatic force?

    <p>The force depends on the distance between the charges.</p> Signup and view all the answers

    What is the result of bringing two charged objects with opposite charges into contact?

    <p>They attract each other more strongly.</p> Signup and view all the answers

    Why do electrons move freely in conductors?

    <p>Because they have a high degree of mobility.</p> Signup and view all the answers

    What happens to the charge on a conductor when it is placed near a sharp point?

    <p>It leaks off.</p> Signup and view all the answers

    What is the principle of conservation of charge?

    <p>The net charge of an isolated system remains constant.</p> Signup and view all the answers

    What is the characteristic of insulators that prevents the even distribution of charge?

    <p>The electrons are bound tightly to the atoms.</p> Signup and view all the answers

    What happens when two identical conducting spheres with different charges come into contact?

    <p>The charges are redistributed evenly.</p> Signup and view all the answers

    What is the primary factor that determines the strength of the electrostatic force?

    <p>The distance between the charges.</p> Signup and view all the answers

    Which of the following materials is a good conductor?

    <p>The human body</p> Signup and view all the answers

    What is the result of tribo-electric charging?

    <p>The transfer of electrons between materials through contact or rubbing.</p> Signup and view all the answers

    What is the primary reason why lightning rods are placed on buildings?

    <p>To safely channel away excess charge</p> Signup and view all the answers

    What is the magnitude of the charge carried by a single electron?

    <p>1.6 x 10^-19 C</p> Signup and view all the answers

    What is the result of polarisation in an insulator?

    <p>A separation of charges within the insulator occurs</p> Signup and view all the answers

    What is the characteristic of materials that allows them to distribute charge evenly over their surfaces?

    <p>Free movement of electrons</p> Signup and view all the answers

    What is the term for the force exerted by a charged object on a neutral insulator?

    <p>Induced dipole force</p> Signup and view all the answers

    What is the experiment that measured the charge of an electron?

    <p>Millikan's oil drop experiment</p> Signup and view all the answers

    What happens when two identical conductors touch?

    <p>They share the total charge between them</p> Signup and view all the answers

    What is the result of placing an excess charge on a spherical conductor?

    <p>The charge is distributed evenly over the surface</p> Signup and view all the answers

    What is the characteristic of certain materials that allows them to experience a force when brought close to a charged object?

    <p>Natural polarisation</p> Signup and view all the answers

    What is the principle that states that any charge in the universe is an integer multiple of the elementary charge?

    <p>The principle of charge quantisation</p> Signup and view all the answers

    What is the primary reason for the placement of lightning rods on buildings?

    <p>To reduce the risk of a lightning strike by safely channeling away excess charge</p> Signup and view all the answers

    What is the net charge of a material with an equal number of protons and electrons?

    <p>Neutral</p> Signup and view all the answers

    What is the result of polarisation when a charged object is brought close to a neutral insulator?

    <p>A small separation of charges within the insulator occurs</p> Signup and view all the answers

    What is the significance of the elementary charge in the principle of charge quantisation?

    <p>It is the unit of charge that all other charges are multiples of</p> Signup and view all the answers

    What happens to the charge on a conductor when it is brought into contact with a neutral object?

    <p>The charge is redistributed evenly over the surface</p> Signup and view all the answers

    What is the characteristic of materials that allows them to distribute charge evenly over their surfaces?

    <p>Ability to move electrons freely</p> Signup and view all the answers

    What is the result of bringing two identical conducting spheres into contact?

    <p>They share the total charge between them, resulting in each having half of the total charge</p> Signup and view all the answers

    What is the significance of sharp points on conductors in relation to lightning strikes?

    <p>They allow charge to leak off, reducing the risk of a lightning strike</p> Signup and view all the answers

    What is the experiment that measured the charge of an electron?

    <p>Millikan's oil drop experiment</p> Signup and view all the answers

    What is the characteristic of water molecules that allows them to be attracted to a charged object?

    <p>They have a distinct positive and negative side</p> Signup and view all the answers

    What is the primary reason why an object becomes electrically charged?

    <p>When there is an imbalance in the number of protons and electrons.</p> Signup and view all the answers

    What happens to the overall charge of an object when electrons are removed?

    <p>The object becomes positively charged.</p> Signup and view all the answers

    What is the primary factor that determines the type of charge an object acquires through tribo-electric charging?

    <p>The material's tendency to gain or lose electrons.</p> Signup and view all the answers

    What happens to the cloth when it is rubbed against a plastic ruler, and why?

    <p>The cloth becomes positively charged because it loses electrons to the ruler.</p> Signup and view all the answers

    What is the characteristic of objects that are electrically neutral?

    <p>They have an equal amount of positive and negative charge.</p> Signup and view all the answers

    What is the purpose of tribo-electric charging in everyday life?

    <p>To create a static charge for a specific purpose.</p> Signup and view all the answers

    What is the result of transferring a negative charge to an object?

    <p>The object becomes negatively charged.</p> Signup and view all the answers

    What is the significance of the tribo-electric series in understanding electric charge?

    <p>It determines the type of charge an object acquires through tribo-electric charging.</p> Signup and view all the answers

    What is the fundamental reason behind the attraction and repulsion between stationary charges?

    <p>The concept of like and opposite charges</p> Signup and view all the answers

    What is the main reason why a charged object can induce a charge on a neutral object, even when they are not in contact?

    <p>The electrostatic force between the charges</p> Signup and view all the answers

    What is the primary reason for the attraction between the glass rod and the plastic rod in the experiment?

    <p>The glass rod is positively charged and the plastic rod is negatively charged.</p> Signup and view all the answers

    What is the characteristic of the electrostatic force between two charges?

    <p>It is inversely proportional to the square of the distance between the charges.</p> Signup and view all the answers

    What determines the strength of the electrostatic force between two charges?

    <p>The distance between the charges</p> Signup and view all the answers

    What happens to the water molecules when a positively charged rod is brought close to a stream of water?

    <p>They align with their negative sides towards the rod.</p> Signup and view all the answers

    What is the primary reason why charge is not created or destroyed during physical processes?

    <p>The conservation of charge</p> Signup and view all the answers

    What happens to the charge on a conductor when it is brought into contact with a neutral object?

    <p>The charge is distributed evenly over the surface of the conductor</p> Signup and view all the answers

    What is the result of rubbing a glass rod with silk and then bringing it close to a similarly charged glass rod?

    <p>The two rods will repel each other.</p> Signup and view all the answers

    Why do materials in a tribo-electric series tend to gain or lose electrons?

    <p>Due to the difference in the molecular structure of the materials</p> Signup and view all the answers

    What is the purpose of the experiment involving rubbing a glass rod with silk and a plastic rod with fur?

    <p>To demonstrate the principles of electrostatic force.</p> Signup and view all the answers

    What is the characteristic of the electrostatic force between two identical charges?

    <p>It is repulsive.</p> Signup and view all the answers

    What is the primary factor that determines the type of charge an object acquires through tribo-electric charging?

    <p>The type of material used in the tribo-electric charging process</p> Signup and view all the answers

    What is the consequence of the uneven distribution of charge on the surface of conductors?

    <p>The leakage of charge from the conductor</p> Signup and view all the answers

    What is the result of bringing a positively charged rod close to a neutral insulator?

    <p>The insulator remains neutral and unaffected.</p> Signup and view all the answers

    What is the significance of the dipolar nature of water molecules?

    <p>It allows them to be attracted to charged objects.</p> Signup and view all the answers

    What is the underlying principle behind the concept of like and opposite charges?

    <p>The electrostatic force between the charges</p> Signup and view all the answers

    What is the significance of the principle of conservation of charge in understanding electrostatic interactions?

    <p>It states that charge is neither created nor destroyed during physical processes</p> Signup and view all the answers

    What is the primary reason why like charges repel each other?

    <p>Because they have the same type of charge</p> Signup and view all the answers

    What is the main factor that determines the strength of the electrostatic force between two charges?

    <p>The distance between the charges</p> Signup and view all the answers

    What happens to the alignment of water molecules when a positively charged rod is brought close to a stream of water?

    <p>They align with their negative sides towards the rod</p> Signup and view all the answers

    What is the reason behind the attraction between opposite charges?

    <p>Because they have different types of charge</p> Signup and view all the answers

    What is the characteristic of materials that allows them to exhibit electrostatic forces?

    <p>Polarity</p> Signup and view all the answers

    What is the result of bringing two rods with the same type of charge close together?

    <p>They repel each other</p> Signup and view all the answers

    What is the primary reason why the electrostatic force is stronger at shorter distances?

    <p>Because the force is inversely proportional to the square of the distance</p> Signup and view all the answers

    What is the characteristic of water molecules that allows them to be polarized?

    <p>Their dipolar nature</p> Signup and view all the answers

    What happens to the electrons in a material when it is rubbed against another material?

    <p>They are transferred from one material to the other</p> Signup and view all the answers

    What is the primary reason why the electrostatic force is important in everyday life?

    <p>It is responsible for the attraction between opposite charges</p> Signup and view all the answers

    What is the effect of bringing two like charges close together?

    <p>They repel each other</p> Signup and view all the answers

    What is the direction of the force between two opposite charges?

    <p>Attractive</p> Signup and view all the answers

    What is the relationship between the strength of the electrostatic force and the distance between the charges?

    <p>Inversely proportional to the square</p> Signup and view all the answers

    What happens to the water molecules when a positively charged rod is brought close to a stream of water?

    <p>They align with their negative sides towards the rod</p> Signup and view all the answers

    What is the purpose of the experiment involving rubbing a glass rod with silk and hanging it from a string?

    <p>To demonstrate the repulsive force between like charges</p> Signup and view all the answers

    What is the characteristic of the electrostatic force that allows it to act over long distances?

    <p>It is a long-range force</p> Signup and view all the answers

    What happens when a negatively charged rod is brought close to a positively charged rod?

    <p>They attract each other</p> Signup and view all the answers

    What is the main property of the electrostatic force that determines its strength?

    <p>The distance between the charges</p> Signup and view all the answers

    What is the result of rubbing a glass rod with silk?

    <p>The glass rod becomes positively charged</p> Signup and view all the answers

    What is the characteristic of the water molecules that allows them to be attracted to a charged object?

    <p>They are polarised</p> Signup and view all the answers

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