A simple pendulum has a metal bob, which is negatively
charged. If it is allowed to oscillate above a positively charged
metallic plate, then its time period will
(a) increase
(b) decrease
(c) become zero
(d) remain the same
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Answer:
Decrease (may be)
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When a negatively charged pendulum oscillates over a positively charged plate then effective value of g increases so according to
T=2\pi \sqrt{l \div g}
T = decreases.
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