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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:

1. increase
2. decrease
3. become zero
4. remain the same

Correct answer: decrease

Solution

The negatively charged bob experiences an additional attractive force due to the positively charged plate. This increases the effective restoring force, which reduces the time period of oscillation.

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