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Q.

A simple pendulum of period T has a metal bob which is negatively charged. If it is allowed to oscillate above a positively charged metal plate, its period will

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a

Remains equal to T

b

Less than T

c

Greater than T

d

Infinite

answer is B.

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Detailed Solution

When a negatively charged pendulum oscillates over a positively charged plate then effective value of g increases so according to T=2πlg, T decreases.
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