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in Physics by (51.1k points)

A simple pendulum has a time period T. The bob is now given some positive charge. 

(a) If some positive charge is placed at the point of suspension, T will increase. 

(b) If some positive charge is placed at the point of suspension, T will not change. 

(c) If a uniform downward electric field is switched on, T will increase. 

(d) If a uniform downward electric field is switched on, T will decrease.

1 Answer

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by (50.3k points)
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Best answer

Correct Answer is: (b, d)

The time period will change only when the additional electrostatic force has a component along the direction of the displacement, which is always perpendicular to the string.

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