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AP EAMCET2006PhysicsOscillations

The bob of simple pendulum is hanging vertically down from a fixed identical bob by means of a sting of length l . If both bobs are charged with a charge q each, time period of the pendulum is : (ignore the radii of the bobs)

Options

  1. A2 l g+ ( q^2 l^2 m )
  2. B2 l g- ( q^2 l^2 m )
  3. C2 l g
  4. D2 l g- ( q^2 l )

Correct answer

C. 2 l g

Step-by-step solution

There will be a electrostatic repulsion between two charged bobs, but it does not affect the motion of pendulum. Thus, time period of pendulum remains same i.e., T=2 l g .

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