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A charge +Q is distributed uniformly thr...

A charge `+Q` is distributed uniformly throughout the volume of a fixed non- conducting sphere of radius `R`.Sphere is placed in a gravity free space and a narrow tunnel is made into it upto depth `(R)/(2)` .Outside the tunnel there is a spring of spring constant `k` .A small test charge of mass `m` and charge `q`is placed at the bottom of the tunnel at rest and is set free.The maximum compression of the spring is `sqrt((aQq)/(16 pi varepsilon_(0)kR))`,a is equal to (maximum compression in spring << `R`

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