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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 from a silk threas between two parallel charged plates.The electric field intensity `E` act vertically downwards . If bob is given a charge `+ q`,time period of oscillation
(i) `T = 2 pi sqrt((l)/((g - (qE)/(m))))` , if the lower plate is charged positively
(ii) `T = 2 pi sqrt((l)/((g - (qE)/(m))))`,if the lower plate is charged negatively
(iii) `T = 2 pi sqrt((l)/((g + (qE)/(m))))`,if the lower plate is charged positively
(iv) `T = 2 pi sqrt((l)/((g + (qE)/(m))))` , if the lower plate is charged negatively

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