164 Questions
What is the condition when an object has equal amounts of positive and negative charge?
Electrically neutral
What is the net charge of an object with 8 positive charges and 6 negative charges?
+2
What carries negative charges?
Electrons
What happens to the number of electrons when an object becomes positively charged?
Electrons are removed
What is tribo-electric charging?
A process of transferring charge through contact or friction
What happens to the cloth when you rub it against a plastic ruler?
The cloth becomes positively charged
What determines the arrangement of materials in a tribo-electric series?
Their tendency to gain or lose electrons
What happens to the amber when wool is rubbed against it?
The amber becomes negatively charged
What is the term for the force exerted by static charges on each other?
Electrostatic force
Which of the following charges attract each other?
Opposite charges
What is the principle that states that charge is neither created nor destroyed?
Conservation of charge
What is the characteristic of materials that allow electrons to move freely?
Conduction
What happens to excess charge on a conductor?
It spreads out uniformly over the surface
What is the result of bringing two identical conducting spheres into contact?
The charge is equally distributed between the two spheres
What is the term for the transfer of electrons between materials through contact or rubbing?
Tribo-electric charging
What is the characteristic of materials that do not allow electrons to move freely?
Insulation
What is the result of placing an excess charge on an insulator?
The charge remains concentrated at the point of contact
What is the significance of sharp points on conductors?
They cause charge to leak off
What is the purpose of a lightning rod on a building?
To reduce the risk of a lightning strike
What is the unit of charge carried by a single electron?
1.6 × 10^(-19) C
What is the principle of charge quantisation?
Any charge in the universe is an integer multiple of the elementary charge
What happens when a charged object is brought close to a neutral insulator?
The insulator becomes polarised
What is the characteristic of conductors that enables them to distribute charge evenly over their surfaces?
Electrons can move freely through the material
What happens when two conductors touch?
They share the total charge between them
What is the characteristic of insulators that prevents the even distribution of charge?
Electrons are bound to the atoms
What is the experiment that measured the charge of an electron?
Millikan's oil drop experiment
What is the phenomenon that occurs when a charged object is brought close to a neutral insulator?
Polarisation
What is the shape of a conductor that enables the even distribution of charge?
Spherical
What happens when two like charges are brought close together?
They repel each other
What is the strength of the electrostatic force proportional to?
The inverse of the distance between the charges
What happens when a glass rod is rubbed with silk?
The glass rod becomes positively charged
What is the result of bringing two rods with opposite charges close together?
They attract each other
What is the purpose of rubbing a glass rod with silk in an experiment?
To make the glass rod positively charged
What is the characteristic of water molecules that allows them to be attracted to a charged object?
They are polarized
What happens when a charged rod is brought close to a stream of water?
The stream of water is attracted to the rod
What is the result of rubbing a plastic rod with fur?
The plastic rod becomes negatively charged
What happens when an object has a net positive charge?
It has more positive charges than negative charges
What is the purpose of tribo-electric charging?
To alter the overall charge of an object
What determines the type of charge an object acquires through tribo-electric charging?
The material's position in the tribo-electric series
Why does an object become positively charged when electrons are removed?
Because the object becomes electron-deficient
What is the result of rubbing a cotton cloth against a plastic ruler?
The ruler becomes positively charged and the cloth becomes negatively charged
What happens when an object has a net negative charge?
It has more negative charges than positive charges
Why do materials in a tribo-electric series tend to gain or lose electrons?
Because of their position in the tribo-electric series
What is the result of transferring negative charge to an object?
The object becomes negatively charged
What is the primary factor that determines the strength of the electrostatic force between two charges?
The distance between the charges
Which of the following statements is true about the conservation of charge?
Charge is neither created nor destroyed
What happens to the charge on a conductor when it is brought into contact with a neutral object?
The charge is evenly distributed across the surface of the conductor
Why do sharp points on conductors cause charge to leak off?
Because the charge is concentrated at the points
What is the characteristic of conductors that allows them to distribute charge evenly over their surfaces?
The electrons are free to move
What happens when two identical conducting spheres come into contact and share their charge?
The charge is evenly distributed between the two spheres
Why do insulators prevent the even distribution of charge?
Because the electrons are bound tightly to the atoms
What is the result of the electrostatic force between two like charges?
Repulsion
What is the significance of the electrostatic force in everyday life?
It is crucial in understanding electrical interactions at the microscopic and macroscopic levels
What is the primary reason for the distribution of charge on a spherical conductor?
The repulsive forces between like charges
What happens to the charge on a conductor when it is placed on a sharp point?
The charge leaks off the conductor.
What is the minimum amount of charge that can exist on an object?
1 elementary charge
Why do insulators not allow electrons to move freely?
Because the electrons are bound to the atoms.
What is the result of polarisation in a neutral insulator?
The insulator remains electrically neutral.
What is the purpose of a lightning rod on a building?
To channel away excess charge and reduce the risk of a lightning strike.
Why do identical conductors share the total charge between them when they touch?
Because the electrons are able to move freely between the conductors.
What is the characteristic of materials that are naturally polarised?
They have distinct positive and negative sides.
What is the result of placing an excess charge on an insulator?
The charge is concentrated at the point where it was deposited.
What is the significance of the experiment known as Millikan's oil drop experiment?
It measured the charge of an electron.
What is the phenomenon that occurs when a charged object is brought close to a neutral insulator?
Polarisation.
What happens when two glass rods, both rubbed with silk, are brought close together?
They repel each other.
What is the direction of the electrostatic force between two opposite charges?
It is attractive.
What happens to the strength of the electrostatic force as the distance between the charges increases?
It decreases.
What is the characteristic of water molecules that allows them to be attracted to a charged object?
They are dipolar.
What happens when a positively charged rod is brought close to a stream of water?
The water molecules align with their negative sides towards the rod.
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?
To demonstrate the attraction between opposite charges.
What is the result of bringing two identical charged rods close together?
They repel each other.
What is the relationship between the strength of the electrostatic force and the distance between the charges?
The force is inversely proportional to the square of the distance.
What is the net charge of an object with 6 positive charges and 9 negative charges?
-3
What happens to an object when it gains electrons?
It becomes negatively charged
What is the purpose of the tribo-electric series?
To arrange materials based on their tendency to gain or lose electrons
What happens to the negative charge when a cotton cloth is rubbed against a plastic ruler?
It is transferred to the ruler
Why do objects become electrically charged when there is an imbalance of positive and negative charges?
Because one type of charge is in excess of the other
What determines the type of charge an object acquires through tribo-electric charging?
The material it comes into contact with
What is the result of having an equal number of positive and negative charges on an object?
The object remains neutral
What happens when an object is electron-deficient?
It becomes positively charged
What is the primary reason why like charges repel each other?
Because they are trying to move away from each other's electric field
What is the significance of the distance between charges in the electrostatic force?
The force is inversely proportional to the distance
What is the characteristic of water molecules that allows them to be attracted to a charged object?
They are polarized, having distinct positive and negative regions
What happens when two rods with opposite charges are brought close together?
They attract each other
What is the purpose of rubbing a glass rod with silk in an experiment?
To create a static electric charge on the glass rod
What is the result of bringing a positively charged rod close to a stream of water?
The water molecules align with their negative sides towards the rod
What happens when a negatively charged rod is brought close to a neutral insulator?
The insulator remains neutral
What is the underlying principle behind the attraction and repulsion between charges?
The conservation of charge
Which of the following is a characteristic of electrostatic force?
The force depends on the distance between the charges.
What is the result of bringing two charged objects with opposite charges into contact?
They attract each other more strongly.
Why do electrons move freely in conductors?
Because they have a high degree of mobility.
What happens to the charge on a conductor when it is placed near a sharp point?
It leaks off.
What is the principle of conservation of charge?
The net charge of an isolated system remains constant.
What is the characteristic of insulators that prevents the even distribution of charge?
The electrons are bound tightly to the atoms.
What happens when two identical conducting spheres with different charges come into contact?
The charges are redistributed evenly.
What is the primary factor that determines the strength of the electrostatic force?
The distance between the charges.
Which of the following materials is a good conductor?
The human body
What is the result of tribo-electric charging?
The transfer of electrons between materials through contact or rubbing.
What is the primary reason why lightning rods are placed on buildings?
To safely channel away excess charge
What is the magnitude of the charge carried by a single electron?
1.6 x 10^-19 C
What is the result of polarisation in an insulator?
A separation of charges within the insulator occurs
What is the characteristic of materials that allows them to distribute charge evenly over their surfaces?
Free movement of electrons
What is the term for the force exerted by a charged object on a neutral insulator?
Induced dipole force
What is the experiment that measured the charge of an electron?
Millikan's oil drop experiment
What happens when two identical conductors touch?
They share the total charge between them
What is the result of placing an excess charge on a spherical conductor?
The charge is distributed evenly over the surface
What is the characteristic of certain materials that allows them to experience a force when brought close to a charged object?
Natural polarisation
What is the principle that states that any charge in the universe is an integer multiple of the elementary charge?
The principle of charge quantisation
What is the primary reason for the placement of lightning rods on buildings?
To reduce the risk of a lightning strike by safely channeling away excess charge
What is the net charge of a material with an equal number of protons and electrons?
Neutral
What is the result of polarisation when a charged object is brought close to a neutral insulator?
A small separation of charges within the insulator occurs
What is the significance of the elementary charge in the principle of charge quantisation?
It is the unit of charge that all other charges are multiples of
What happens to the charge on a conductor when it is brought into contact with a neutral object?
The charge is redistributed evenly over the surface
What is the characteristic of materials that allows them to distribute charge evenly over their surfaces?
Ability to move electrons freely
What is the result of bringing two identical conducting spheres into contact?
They share the total charge between them, resulting in each having half of the total charge
What is the significance of sharp points on conductors in relation to lightning strikes?
They allow charge to leak off, reducing the risk of a lightning strike
What is the experiment that measured the charge of an electron?
Millikan's oil drop experiment
What is the characteristic of water molecules that allows them to be attracted to a charged object?
They have a distinct positive and negative side
What is the primary reason why an object becomes electrically charged?
When there is an imbalance in the number of protons and electrons.
What happens to the overall charge of an object when electrons are removed?
The object becomes positively charged.
What is the primary factor that determines the type of charge an object acquires through tribo-electric charging?
The material's tendency to gain or lose electrons.
What happens to the cloth when it is rubbed against a plastic ruler, and why?
The cloth becomes positively charged because it loses electrons to the ruler.
What is the characteristic of objects that are electrically neutral?
They have an equal amount of positive and negative charge.
What is the purpose of tribo-electric charging in everyday life?
To create a static charge for a specific purpose.
What is the result of transferring a negative charge to an object?
The object becomes negatively charged.
What is the significance of the tribo-electric series in understanding electric charge?
It determines the type of charge an object acquires through tribo-electric charging.
What is the fundamental reason behind the attraction and repulsion between stationary charges?
The concept of like and opposite charges
What is the main reason why a charged object can induce a charge on a neutral object, even when they are not in contact?
The electrostatic force between the charges
What is the primary reason for the attraction between the glass rod and the plastic rod in the experiment?
The glass rod is positively charged and the plastic rod is negatively charged.
What is the characteristic of the electrostatic force between two charges?
It is inversely proportional to the square of the distance between the charges.
What determines the strength of the electrostatic force between two charges?
The distance between the charges
What happens to the water molecules when a positively charged rod is brought close to a stream of water?
They align with their negative sides towards the rod.
What is the primary reason why charge is not created or destroyed during physical processes?
The conservation of charge
What happens to the charge on a conductor when it is brought into contact with a neutral object?
The charge is distributed evenly over the surface of the conductor
What is the result of rubbing a glass rod with silk and then bringing it close to a similarly charged glass rod?
The two rods will repel each other.
Why do materials in a tribo-electric series tend to gain or lose electrons?
Due to the difference in the molecular structure of the materials
What is the purpose of the experiment involving rubbing a glass rod with silk and a plastic rod with fur?
To demonstrate the principles of electrostatic force.
What is the characteristic of the electrostatic force between two identical charges?
It is repulsive.
What is the primary factor that determines the type of charge an object acquires through tribo-electric charging?
The type of material used in the tribo-electric charging process
What is the consequence of the uneven distribution of charge on the surface of conductors?
The leakage of charge from the conductor
What is the result of bringing a positively charged rod close to a neutral insulator?
The insulator remains neutral and unaffected.
What is the significance of the dipolar nature of water molecules?
It allows them to be attracted to charged objects.
What is the underlying principle behind the concept of like and opposite charges?
The electrostatic force between the charges
What is the significance of the principle of conservation of charge in understanding electrostatic interactions?
It states that charge is neither created nor destroyed during physical processes
What is the primary reason why like charges repel each other?
Because they have the same type of charge
What is the main factor that determines the strength of the electrostatic force between two charges?
The distance between the charges
What happens to the alignment of water molecules when a positively charged rod is brought close to a stream of water?
They align with their negative sides towards the rod
What is the reason behind the attraction between opposite charges?
Because they have different types of charge
What is the characteristic of materials that allows them to exhibit electrostatic forces?
Polarity
What is the result of bringing two rods with the same type of charge close together?
They repel each other
What is the primary reason why the electrostatic force is stronger at shorter distances?
Because the force is inversely proportional to the square of the distance
What is the characteristic of water molecules that allows them to be polarized?
Their dipolar nature
What happens to the electrons in a material when it is rubbed against another material?
They are transferred from one material to the other
What is the primary reason why the electrostatic force is important in everyday life?
It is responsible for the attraction between opposite charges
What is the effect of bringing two like charges close together?
They repel each other
What is the direction of the force between two opposite charges?
Attractive
What is the relationship between the strength of the electrostatic force and the distance between the charges?
Inversely proportional to the square
What happens to the water molecules when a positively charged rod is brought close to a stream of water?
They align with their negative sides towards the rod
What is the purpose of the experiment involving rubbing a glass rod with silk and hanging it from a string?
To demonstrate the repulsive force between like charges
What is the characteristic of the electrostatic force that allows it to act over long distances?
It is a long-range force
What happens when a negatively charged rod is brought close to a positively charged rod?
They attract each other
What is the main property of the electrostatic force that determines its strength?
The distance between the charges
What is the result of rubbing a glass rod with silk?
The glass rod becomes positively charged
What is the characteristic of the water molecules that allows them to be attracted to a charged object?
They are polarised
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