Gr 10 Physical Sciences Ch 13: Potential difference and emf
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Questions and Answers

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

  • -1.6 × 10^19 A
  • -1.6 × 10^19 C
  • 1.6 × 10^-19 C (correct)
  • 1.6 × 10^19 C

    • What is the principle of charge quantisation?

  • Any charge in the universe is a multiple of 1 C.
  • Any charge in the universe is an integer multiple of the elementary charge. (correct)
  • Any charge in the universe is a multiple of 10^-19 C.
  • Any charge in the universe is a multiple of the charge on a proton.

    • What is the unit of charge commonly used in electrostatics?

  • Coulombs (C)
  • Microcoulombs (μC)
  • Nanocoulombs (nC)
  • All of the above (correct)

    • What experiment measured the charge of an electron?

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

    What is the effect of a charged object on a neutral insulator?

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

    What happens to the electrons in an insulator when a charged object is brought close?

    <p>They are attracted to the charged object.</p> Signup and view all the answers

    What is the net charge of an insulator after polarisation?

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

    What is the movement of electrons like in an insulator?

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

    What happens when a positively charged rod is brought near a small polystyrene ball?

    <p>The ball becomes polarised with electrons moving towards the rod and positive nuclei moving away.</p> Signup and view all the answers

    Why does a polystyrene ball remain electrically neutral?

    <p>Because no net charge has been added or removed.</p> Signup and view all the answers

    What is the characteristic of conductors?

    <p>They distribute charge evenly over their surfaces.</p> Signup and view all the answers

    What happens when two identical conductors touch and share excess charge?

    <p>Each conductor has half of the total charge after separation.</p> Signup and view all the answers

    What is the electrostatic force?

    <p>A force that acts between static electric charges.</p> Signup and view all the answers

    What happens when like charges interact?

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

    What is the effect of distance on the electrostatic force?

    <p>The force decreases as the distance increases.</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 an example of a naturally polarised substance?

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

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

    <p>To create a positively charged rod</p> Signup and view all the answers

    What is the significance of the elementary charge in the universe?

    <p>It is the smallest unit of charge found in nature.</p> Signup and view all the answers

    What is the mathematical expression for the principle of charge quantisation?

    <p>Q = n * q_e</p> Signup and view all the answers

    Why do electrons and nuclei in an insulator shift when a charged object is brought close?

    <p>The charged object attracts the electrons and repels the nuclei.</p> Signup and view all the answers

    What is the result of polarisation in an insulator?

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

    What is the relationship between the charge on a single electron and a proton?

    <p>The charge on a proton is equal in magnitude to the charge on an electron.</p> Signup and view all the answers

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

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

    What happens to the electrons in a conductor when an excess charge is placed on it?

    <p>They move freely to the surface of the conductor.</p> Signup and view all the answers

    What is the significance of the coulomb as a unit of charge?

    <p>It is a large unit of charge used in electrostatics.</p> Signup and view all the answers

    What is the result of bringing two identical conductors with excess charge together?

    <p>The total charge is shared evenly between the two conductors.</p> Signup and view all the answers

    What is the effect of polarisation on the movement of electrons in an insulator?

    <p>The electrons are bound to the atoms and cannot move freely.</p> Signup and view all the answers

    What is the characteristic of an insulator?

    <p>Electrons are localized and do not move freely.</p> Signup and view all the answers

    What is the force between two opposite charges?

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

    What is the effect of distance on the electrostatic force?

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

    What happens to a polarised molecule when it is brought close to a charged object?

    <p>It aligns its positive and negative sides with the electric field.</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 are attracted to the rod.</p> Signup and view all the answers

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

    <p>The insulator remains neutral, but its electrons are polarised.</p> Signup and view all the answers

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

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

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

    <p>Away from each other.</p> Signup and view all the answers

    What is the significance of the elementary charge in the universe?

    <p>It is the smallest unit of charge that can exist.</p> Signup and view all the answers

    What is the result of polarisation in an insulator?

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

    Why do electrons and nuclei in an insulator shift when a charged object is brought close?

    <p>Due to the electrostatic force between the charged object and the insulator.</p> Signup and view all the answers

    What is the relationship between the charge on a single electron and a proton?

    <p>The charge on a proton is opposite in sign and equal in magnitude to the charge on an electron.</p> Signup and view all the answers

    What is the advantage of using microcoulombs or nanocoulombs to measure charge?

    <p>They are more practical for measuring small charges in electrostatics.</p> Signup and view all the answers

    What is the purpose of Millikan's oil drop experiment?

    <p>To measure the charge of an electron.</p> Signup and view all the answers

    What is the characteristic of an insulator?

    <p>Electrons are bound to the atoms and cannot move freely through the material.</p> Signup and view all the answers

    What is the mathematical expression for the principle of charge quantisation?

    <p>Q = n * q_e</p> Signup and view all the answers

    What happens when a positively charged rod is brought near a small, electrically neutral, polystyrene ball?

    <p>The ball becomes electrically polarised, with electrons moving towards the rod and positive nuclei moving away</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, while being electrically neutral overall</p> Signup and view all the answers

    What happens to the charge on a conductor when an excess charge is placed on it?

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

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

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

    What happens when two identical conductors touch and share excess charge?

    <p>The total charge is shared evenly between the two conductors</p> Signup and view all the answers

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

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

    What is the effect of polarisation on the movement of electrons in an insulator?

    <p>Electrons move towards the charged object, while positive nuclei move away</p> Signup and view all the answers

    What happens when a charged object is brought close to a polarised molecule?

    <p>The molecule becomes attracted to the charged object</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 strength of the electrostatic force is inversely proportional to the distance between the charges</p> Signup and view all the answers

    What is the characteristic of insulators?

    <p>They do not allow free movement of electrons</p> Signup and view all the answers

    What is the reason why the charge on a single electron is considered as the elementary charge?

    <p>It is the basic unit of charge, and all other charges are an integer multiple of it.</p> Signup and view all the answers

    What is the significance of polarisation in insulators?

    <p>It creates a small separation of charges within the insulator, even though the overall charge remains neutral.</p> Signup and view all the answers

    What is the purpose of using microcoulombs or nanocoulombs to measure charge?

    <p>Because the coulomb is a unit of charge that is too large for most electrostatic applications.</p> Signup and view all the answers

    What is the relationship between the charge on a single electron and a proton?

    <p>The charge on a single electron is equal in magnitude but opposite in sign to the charge on a proton.</p> Signup and view all the answers

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

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

    What is the characteristic of materials that are naturally polarised?

    <p>They have a permanent electric dipole moment.</p> Signup and view all the answers

    What is the mathematical expression for the principle of charge quantisation?

    <p>Q = ne</p> Signup and view all the answers

    What is the reason why charge is measured in coulombs?

    <p>Because it is a fundamental unit of charge in the SI system.</p> Signup and view all the answers

    What is the primary reason why a polystyrene ball remains electrically neutral despite being polarised by a charged rod?

    <p>No net charge is added or removed from the ball.</p> Signup and view all the answers

    What is the main difference between the behaviour of electrons in conductors and insulators?

    <p>Electrons in conductors move freely, while those in insulators do not.</p> Signup and view all the answers

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

    <p>The electrostatic force is inversely proportional to the square of the distance between the charges.</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 characteristic of materials that are naturally polarised, such as water?

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

    What is the result of bringing two identical conductors with excess charge together?

    <p>Both conductors share the total charge evenly.</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 electrostatic force between opposite charges.</p> Signup and view all the answers

    What is the effect of polarisation on the movement of electrons in an insulator?

    <p>The electrons are localized in the insulator.</p> Signup and view all the answers

    What is the characteristic of a material that is a good conductor of electricity?

    <p>It allows electrons to move freely through it.</p> Signup and view all the answers

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

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

    What is the result of the polarisation of a small, electrically neutral, polystyrene ball when a positively charged rod is brought near it?

    <p>The ball is attracted to the rod due to the induced dipole effect, but remains electrically neutral.</p> Signup and view all the answers

    What is the characteristic of materials that are naturally polarised, like water?

    <p>They are electrically neutral, but with distinct positive and negative sides.</p> Signup and view all the answers

    What happens to the charge on a conductor when an excess charge is placed on it?

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

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

    <p>The force is always attractive.</p> Signup and view all the answers

    What happens to the electrons in a conductor when an excess charge is placed on it?

    <p>The electrons are free to move, and the excess charge is distributed evenly over the surface of the conductor.</p> Signup and view all the answers

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