Gr 10 Physical Sciences Ch 12: Quantisation of charge
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Questions and Answers

What is the principle of charge quantisation?

  • The charge on a single electron is zero.
  • The charge on a proton is negative.
  • Any charge in the universe is an integer multiple of the elementary charge. (correct)
  • Any charge in the universe can be any real number.

What is the charge on a single electron in coulombs?

  • 1.6 × 10^(-20) C
  • -1.6 × 10^(-19) C (correct)
  • 1.6 × 10^(-19) C
  • 1.6 × 10^(-18) C

What is the unit of charge in which charges are often measured in electrostatics?

  • Microcoulombs (correct)
  • Nanocoulombs (correct)
  • Coulombs
  • Amperes

What is the experiment known as in which the charge of an electron was measured?

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

What is the phenomenon where a charged object exerts a force on a neutral insulator?

<p>Polarisation (A)</p> Signup and view all the answers

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

<p>They are attracted towards the rod (D)</p> Signup and view all the answers

What is the overall charge of an insulator after polarisation?

<p>Neutral (B)</p> Signup and view all the answers

Why do electrons not move freely through an insulator?

<p>Because they are bound to the atoms (A)</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 (C)</p> Signup and view all the answers

What is the main characteristic of conductors?

<p>They allow electrons to move freely through them (C)</p> Signup and view all the answers

What happens when excess charge is placed on an insulator?

<p>The charge remains localized where it was deposited (D)</p> Signup and view all the answers

What is the electrostatic force?

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

What happens when two identical conductors touch and share the total charge between them?

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

What is the strength of the electrostatic force proportional to?

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

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

<p>The rods attract each other (A)</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 (A)</p> Signup and view all the answers

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

<p>The water molecules align with their negative sides towards the object (A)</p> Signup and view all the answers

Why do water molecules align with their negative sides towards a charged object?

<p>Because they are naturally polarised (D)</p> Signup and view all the answers

What is the smallest unit of charge that can exist independently?

<p>1 electron charge (A)</p> Signup and view all the answers

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

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

What is the direction of the force experienced by the positively charged nuclei in a neutral insulator when a charged object is brought close to it?

<p>Away from the charged object (A)</p> Signup and view all the answers

What is the reason for the attraction between a charged object and a neutral insulator?

<p>The charged object induces a shift in the positions of the electrons and nuclei within the atoms (A)</p> Signup and view all the answers

What is the result of the polarisation of a neutral insulator?

<p>The insulator remains neutral but with a small separation of charges (B)</p> Signup and view all the answers

What is the reason for the limitation of electron movement in an insulator?

<p>Electrons are bound to the atoms (D)</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 (C)</p> Signup and view all the answers

What is the relation between the charge on a proton and an electron?

<p>The charge on a proton is the same magnitude as the charge on an electron but opposite in sign (D)</p> Signup and view all the answers

What is the reason behind the attraction between a polarised ball and a charged rod?

<p>Electrons move towards the rod and positive nuclei move away (B)</p> Signup and view all the answers

Which of the following materials consists of naturally polarised molecules?

<p>Water (A)</p> Signup and view all the answers

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

<p>The like charges repel each other and spread out uniformly (C)</p> Signup and view all the answers

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

<p>The rods attract each other (C)</p> Signup and view all the answers

Why do areas of concentrated charge form on an insulator?

<p>The immobility of electrons prevents the even distribution of charge (D)</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 principles of electrostatic force (B)</p> Signup and view all the answers

What happens when two identical conductors touch and share the total charge between them?

<p>Each conductor has half of the total charge (D)</p> Signup and view all the answers

Why do water molecules align with their negative sides towards a charged object?

<p>Because water molecules are dipolar and respond to the electric field (D)</p> Signup and view all the answers

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

<p>The free movement of electrons (A)</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 (D)</p> Signup and view all the answers

What is the meaning of the integer n in the mathematical expression of the principle of charge quantisation?

<p>The integer multiple of the elementary charge (C)</p> Signup and view all the answers

What happens to the nucleus in an atom when a charged object is brought close to a neutral insulator?

<p>It is repelled by the charged object (C)</p> Signup and view all the answers

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

<p>To determine the elementary charge (B)</p> Signup and view all the answers

Why do electrons not move freely through an insulator?

<p>Because they are bound to the atoms (A)</p> Signup and view all the answers

What is the effect of polarisation on a neutral insulator?

<p>It creates a small separation of charges (D)</p> Signup and view all the answers

What is the unit of charge in which the charge of an electron is usually expressed?

<p>Nanocoulombs (nC) (B)</p> Signup and view all the answers

What is the result of the interaction between a charged object and a neutral insulator?

<p>A force is exerted on the insulator (B)</p> Signup and view all the answers

What is the significance of the elementary charge?

<p>It is the smallest unit of charge that can exist independently (B)</p> Signup and view all the answers

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

<p>It becomes polarised (C)</p> Signup and view all the answers

Why do conductors allow electrons to move freely?

<p>Because of their atomic structure (B)</p> Signup and view all the answers

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

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

What happens to the charge on two identical conductors when they touch and separate?

<p>Both conductors share the total charge equally (A)</p> Signup and view all the answers

Why does a stream of water bend towards a positively charged object?

<p>As a result of the alignment of water molecules' dipoles (D)</p> Signup and view all the answers

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

<p>The immobility of electrons (B)</p> Signup and view all the answers

What is the direction of the electrostatic force between two oppositely charged rods?

<p>Attractive (C)</p> Signup and view all the answers

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

<p>They are evenly distributed (D)</p> Signup and view all the answers

Why do areas of concentrated charge form on an insulator?

<p>Due to the immobility of electrons (D)</p> Signup and view all the answers

What is the purpose of the electrostatic force experiment involving rubbing a glass rod with silk?

<p>To illustrate the attraction between opposite charges (C)</p> Signup and view all the answers

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

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

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

<p>Polarisation of the insulator. (C)</p> Signup and view all the answers

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

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

What is the main characteristic of conductors that enables them to distribute charge evenly?

<p>Free movement of electrons. (A)</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. (D)</p> Signup and view all the answers

What is the result of polarisation on a neutral insulator?

<p>The insulator remains neutral. (C)</p> Signup and view all the answers

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

<p>The charge on a proton is opposite in sign to that on an electron. (D)</p> Signup and view all the answers

What is the unit of charge in which the charge of an electron is usually expressed?

<p>Elementary charges (e) (C)</p> Signup and view all the answers

What is the primary reason why polarised molecules experience a force when brought close to a charged object?

<p>Because they have distinct positive and negative sides (C)</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 spread out uniformly over the surface of the conductor (D)</p> Signup and view all the answers

Why do areas of concentrated charge form on an insulator?

<p>Because the electrons are localized where they were deposited (C)</p> Signup and view all the answers

What is the reason behind the attraction between two objects with opposite charges?

<p>Because they have opposite types of charge (D)</p> Signup and view all the answers

What happens to the charge on a polystyrene ball when it is brought near a positively charged rod?

<p>The ball remains electrically neutral (B)</p> Signup and view all the answers

What is the characteristic of conductors that enables them to share charge between them?

<p>They allow electrons to move freely (D)</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 (A)</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 (B)</p> Signup and view all the answers

Why do like charges repel each other?

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

What is the primary reason why conductors are able to distribute charge evenly over their surfaces?

<p>Because they allow electrons to move freely (B)</p> Signup and view all the answers

What is the reason behind the repulsion between two identical charged rods?

<p>The like charges repel each other (A)</p> Signup and view all the answers

Why do insulators not allow free movement of electrons?

<p>Because the electrons are tightly bound to their nuclei (B)</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 (A)</p> Signup and view all the answers

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

<p>The ability to allow electrons to move freely (D)</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 (D)</p> Signup and view all the answers

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