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.