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Q.

A solid sphere of mass m suspended by a inextensible massless string is given  angular disturbance. The solid sphere is negatively charged. If it is allowed to  oscillate above a large positively charged metallic plate. Its period

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a

increases

b

remains the same

c

may increase or decrease

d

decreases

answer is D.

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Detailed Solution

The time period of oscillation is given by  T=2πlgThe effective value of g increases due to increase in attraction between positively  charged metallic plate and negatively charged metallic bob. Hence time period  decreases.
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