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  4. 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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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

Electric Charges and Fields

Solution:

When a negatively charged pendulum oscillates over a positively charged plate, then effective value of $g$ increases, so according to $T=2 \pi \sqrt{\frac{l}{g}}, T$ decreases.