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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=2pisqrt(L/(g-(q E)/m)` when lower plate is charged positively

B

`T=2pisqrt(L/(g-(q E)/m)` when lower plate is charged negatively

C

`T=2pisqrt(L/(g+(q E)/m)` when lower plate is charged negatively

D

Both (1) and (3)

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