A simple pendulum has time period T. The bob is given negative charge and surface below it is given positive charge. The new time period will be:

Question

A simple pendulum has time period T. The bob is given negative charge and surface below it is given positive charge. The new time period will be: (A) less than T (B) greater than T (C) equal to T (D) infinite

Tardigrade Admin · Accepted Answer

Opposite charges attract each other. For SHM a restoring force acts on the bob this restoring force is accompanied by electrical force. Hence, restoring force changes from

- m g sin θ

to

- m g^{'} sin θ

where

g^{'} = g + \frac{F _{e}}{M}

.
Also

T = 2 π \frac{displacement}{acceleration}

Since, acceleration increases time period decreases.

Q. A simple pendulum has time period T. The bob is given negative charge and surface below it is given positive charge. The new time period will be:

less than T

greater than T

equal to T

infinite

Q. A simple pendulum has time period $T$ . The bob is given negative charge and surface below it is given positive charge. The new time period will be: