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A pendulum bob carries a - Ve charge - q...

A pendulum bob carries a - Ve charge - q . A positive charge + q is held at the point of support . Then the time period of the bob is :

A

greater than `2pisqrtl//g`

B

less than `2pisqrtL//g`

C

equal to `2pi sqrtL//g`

D

equal to `2pisqrt2L//g`

Text Solution

Verified by Experts

The correct Answer is:
C
There is no change in the restoring force as the electrostatic forces are the central forces. Negative and positive charges at the two extremities of the string affect tension T which does not affect the restoring force. Hence, time period of the bob will remain unchanged.
ie, `T = 2pi sqrt((L)/(g))`
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