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A simple pendulum of length l has a bob ...

A simple pendulum of length `l` has a bob of mass `m` , with a charge `q` on it. A vertical sheet of charge , with the vertical . Its time period of oscillation is `T` in this position
(i) `tan theta = (sigma q)/(2 epsilon_(0) mg)`
(ii) `tan theta = (sigma q)/(epsilon_(0) mg)`
(iii) `T lt 2 pi sqrt((l)/(g))`
(iv) `T gt 2pi ((l)/(g))`

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