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There is a uniform horizontal electric f...

There is a uniform horizontal electric field of strength E in a region. A pendulum bob is pulled to make the string horizontal and released. The bob has mass m and charge q. (a) Find the maximum angle `(theta_(0))` that the bob swings before coming to rest momentarily. (b) Find E if the bob comes to rest when the string is vertical.

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The correct Answer is:
(a) `theta_(0)=2tan^(-1)((qE)/(mg))`
(b) `E=(mg)/(q)`
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