Estimating Density of Electric Field Lines Quiz
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Questions and Answers

What information do field lines provide about the electric field?

  • Magnitude of the electric field
  • Number of field lines per unit length
  • Direction of the electric field at different points in space (correct)
  • Density of the field lines

    • How does the number of field lines passing through an enclosing area change with distance from a point charge?

  • Decreases linearly with distance
  • Varies inversely with the square of the distance
  • Remains constant regardless of distance (correct)
  • Increases linearly with distance

    • In what manner do field lines crowd where the electric field is strong?

  • They become thicker (correct)
  • They do not crowd at all
  • They become more spaced out
  • They become thinner

    • What is the relationship between the number of field lines crossing an area element and the magnitude of the electric field at that point?

    <p>Directly proportional</p> Signup and view all the answers

    What happens to field lines when the electric field strength is weak?

    <p>They become sparser</p> Signup and view all the answers

    What does the relative density (closeness) of field lines indicate?

    <p>Relative strength of the electric field at different points</p> Signup and view all the answers

    What is the expression for the solid angle DW subtended by a small perpendicular plane area DS at a distance r in three dimensions?

    <p>DW = DS/r^2</p> Signup and view all the answers

    In a given solid angle, what remains the same regarding the number of field lines?

    <p>The number of radial field lines</p> Signup and view all the answers

    What did Faraday call the visual representation of electric fields around charged configurations?

    <p>Lines of force</p> Signup and view all the answers

    What was Faraday's purpose in inventing the picture of field lines?

    <p>To provide an intuitive way of visualizing electric fields</p> Signup and view all the answers

    What is the dependence of the strength of the electric field on the distance from the charge?

    <p>$1/r^2$ dependence</p> Signup and view all the answers

    How is the angle subtended by a small transverse line element Dl approximated at a distance r from a point O?

    <p>$Dq = Dl/r$</p> Signup and view all the answers

    What is physically significant when considering electric flux?

    <p>The relative number of field lines crossing a given area</p> Signup and view all the answers

    What is the unit of electric flux?

    <p>N/C</p> Signup and view all the answers

    How can the total electric flux through a surface be calculated?

    <p>By integrating the dot product of the electric field and area element over the surface</p> Signup and view all the answers

    What condition needs to be satisfied for the approximation in calculating electric flux to be exact?

    <p>Electric field must be constant and small area element tends to zero</p> Signup and view all the answers

    In what direction is the line connecting the two charges of an electric dipole defined?

    <p>From positive charge to negative charge</p> Signup and view all the answers

    What is true about the total charge of an electric dipole?

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

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