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>>Oscillations
>>Simple Harmonic Motion
>> $If a positively charged pendulum is osci$

Question

If a positively charged pendulum is oscillating in a uniform electric field as shown in Figure. Its
time period of SHM as compared to that when it was uncharged.

41390

A

Will increase

B

Will decrease

C

Will not change

D

Will first increase then decrease

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Updated on : 2022-09-05

Solution

Verified by Toppr

Correct option is A)

The Time Period of pendulum, T= $2 π \frac{l}{g _{e f f}}$
where $g_{e f f} = g - \frac{q E}{m}$
when E comes to in picture then $g_{e f f}$ decreases . Therefore, Time period increases.
Hence, Option A is answer.

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