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Electric Fields and Potential. Please help me!

  1. Feb 14, 2009 #1
    Physics Mutiple Choice Problems! Please help and explain why. Thank you :)

    1. Which of the following statements is true concerning the spacing of the electric field lines in the vicinity of two point charges of equal magnitude and equal sign?
    A It indicates the relative magnitude of the electric field.
    B It indicates the direction of the electric field.
    C It does not depend on the magnitude of the charges.
    D It is large when the magnitude of the charges is large.
    E It is small when the magnitude of the charges is small.

    2.Which one of the following statements is true concerning the NET work done by moving an electron at constant speed between two points in an electrostatic field?
    A It is always positive.
    B It depends only on the displacement of the electron.
    C It depends on the total distance covered.
    D It is always negative.
    E It is always zero.

    3. Two positive point charges are separated by a distance R. If the distance between the charges is reduced to R/2, what happens to the total electric potential energy of the system?
    A It increases by a factor of 4.
    B It remains the same.
    C It is reduced to 1/2 the original value.
    D It is reduced to 1/4 the original value.
    E It is doubled.

    4.Which one of the following statements concerning electrostatic situations is FALSE?
    A Equipotential surfaces cross paths with one another.
    B Equipotential surfaces are always perpendicular to E.
    C It takes zero work to move a charge along an equipotential surface.
    D If V is constant throughout a region of space the E must be zero in that region.
    E is zero everywhere inside a conductor.

    5.Which one of the following statements best describes the equipotential surfaces surrounding a point charge?
    A The equipotential surfaces are concentric spheres with the charge at the center.
    B The equipotential surfaces are concentric cylinders with the charge on the axis at the center.
    C The equipotential surfaces are concentric cubes with the charge at the center.
    D The equipotential surfaces are curved planes surrounding the charge, but only one passes through the charge.
    E The equipotential surfaces are planes extending radially outward from the charge.
     
  2. jcsd
  3. Feb 14, 2009 #2
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