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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

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+1 vote
by (9.9k points)

If the field is vertical then it will affect the SHM. We have to see whether the force qE (where q is the charge and E is the electric field) is dowdward or upward. If the time period is T=2∏√(l/g) then it will be

g′=g+qE/m when force is downward

g′=g-Eq/m when force is upward.

So in your case the force is upward therefore, its time period will increase.

option (A) is correct

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