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A uniform vertical electric field E is established in the space between two large parallel plates. A small conducting sphere of mass m is suspended in the field from a string of length L . If the spheres is given a positive charge q and the lower plate is charged positively, the period of oscillation of this pendulum is

Options

  1. A2 L g
  2. B2 L g+(q E / m)
  3. C2 L g-(q E / m)
  4. D2 L [g^2+(q E / m)^2 ]^ 1 / 2

Correct answer

C. 2 L g-(q E / m)

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