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A small metallic bob of mass m of a simp...

A small metallic bob of mass m of a simple pendulum of length L is suspended between the two oppositely charged large parallel plates . The electric field E act vertically. If positive charge 'q' is given to bob and displaced slightly from mean position then time period of oscillation will be

A

`T=2pi(L/(g-(qE/m)))^(1/2)` when lower plate charge positively

B

`T=2pi(L/(g-(qE/m)))^(1/2)` when lower plate charge negatively

C

`T=2pi(L/(g+(qE/m)))^(1/2)` when lower plate charge negatively

D

both a and c

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