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Wave Speed expression

A simple pend...

Question

A simple pendulum of period T has a metal bob which is negatively charged. If it is allowed to oscillate above a large positively charged metallic plate, its period of oscillation will be:

A

Increases

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B

Remains the same

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C

May increase or decrease

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D

Decreases

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Solution

The correct option is D
Decreases

The effective value of g increases due to increase in attraction between the positively charged metallic plate and negatively charged metallic bob. Hence the time period decreases. $∵ T \propto \frac{1}{\sqrt{g}}$

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