A simple pendulum of length l and bob ma...

A simple pendulum of length `l` and bob mass `m` is hanging in front of a large nonconducting sheet having surface charge density `sigma`. If suddenly a charge `+q` is given to the bob `&` it is released from the position shown in figure. Find the maximum angle through which the string is deflected from vertical .
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The correct Answer is:

`((sigmarho_(0))/(2epsi_(0)mg))`

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