Electric Charges and Fields
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Questions and Answers

What happens when two glass rods rubbed with wool are brought close to each other?

  • They repel each other (correct)
  • They attract each other
  • They remain neutral
  • They attract then repel each other
  • What happens when two strands of wool rubbed with the glass rods are brought close to each other?

  • They repel each other (correct)
  • They attract then repel each other
  • They attract each other
  • They remain neutral
  • What happens when two plastic rods rubbed with cat's fur are brought close to each other?

  • They repel each other (correct)
  • They remain neutral
  • They attract each other
  • They attract then repel each other
  • What do glass rods do when brought close to the fur?

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

    What is the property that differentiates the two kinds of charges?

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

    When a glass rod is rubbed with silk, what kind of charge does the rod acquire?

    <p>Positive charge</p> Signup and view all the answers

    What type of forces hold molecules and atoms together in a solid?

    <p>Electrical forces</p> Signup and view all the answers

    How is a body charged positively according to the text?

    <p>By losing electrons</p> Signup and view all the answers

    What happens to the glass rod when rubbed with silk according to the text?

    <p>It loses electrons</p> Signup and view all the answers

    What type of substances allow electricity to pass through them easily?

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

    How is a body charged negatively according to the text?

    <p>By gaining electrons</p> Signup and view all the answers

    What happens to the silk cloth when rubbed with a glass rod according to the text?

    <p>It gains electrons</p> Signup and view all the answers

    What is the rationale behind the statement that electrostatic field lines do not form closed loops?

    <p>It is a consequence of the conservative nature of electric field.</p> Signup and view all the answers

    What does the rate of flow of liquid through a small surface represent?

    <p>The amount of liquid moving across the surface at any given time</p> Signup and view all the answers

    In the context of electric flux, what does 'v.n̂ dS' represent?

    <p>Flux going out of the surface</p> Signup and view all the answers

    How is the strength of an electric field at a point determined?

    <p>By counting the number of field lines crossing a unit area normal to the field</p> Signup and view all the answers

    What does tilting an area element by an angle 'q' change in the context of electric field lines?

    <p>The density of field lines passing through it</p> Signup and view all the answers

    How does the concept of electric flux differ from physical flow like that of liquids?

    <p>There is no movement involved in electric flux calculations.</p> Signup and view all the answers

    Which type of quantity can be scalar but not conserved, as exemplified by kinetic energy in an inelastic collision?

    <p>Scalar quantity</p> Signup and view all the answers

    What is an example of a conserved vector quantity mentioned in the text?

    <p>Angular momentum of an isolated system</p> Signup and view all the answers

    Which statement about the superposition principle is correct?

    <p>Force on one charge due to another is unaffected by other charges</p> Signup and view all the answers

    In what scenario is the electric field due to a discrete charge configuration not defined according to the text?

    <p>Locations of discrete charges</p> Signup and view all the answers

    For a charge configuration with total charge zero, what happens to the electric field for distances large compared to the size of the configuration?

    <p>Falls off faster than 1/r^2</p> Signup and view all the answers

    Why is there no analogous law on quantization of mass as stated in the text?

    <p>Quantization of electric charge is a basic law</p> Signup and view all the answers

    What is the magnitude of the electric field vector E1B at point B due to the positive charge q1?

    <p>3.6 × 10^4 N C^–1</p> Signup and view all the answers

    In which direction does the electric field vector E2B at point B due to the negative charge q2 point?

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

    What is the total magnitude of the electric field at point B?

    <p>3.2 × 10^4 N C^–1</p> Signup and view all the answers

    What is the direction of the electric field vector EC at point C?

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

    How is the strength of the electric field represented pictorially due to a point charge?

    <p>With vectors pointing outward with varying lengths</p> Signup and view all the answers

    What is the formula mentioned in the text for calculating EC, the magnitude of each electric field vector at point C?

    <p>(9 × 10^9 Nm^2 C^–2) × (10^-8 C) = 9 × 10^3 N C^–1 (0.10 m)^2 π + E2c cos</p> Signup and view all the answers

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