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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

Infinite

b

Remains equal to T

c

Greater than T

d

Less than T

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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