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A large solid sphere with uniformly dist...

A large solid sphere with uniformly distributed positive charge has a smooth narrow tunnel along its direction. A small particle with negative charge, initially at rest far from the sphere, approaches it along the line of the tunnel, reaches its surface with a speed `v`, and passes through the tunnel. Its speed at the centre of the sphere will be

A

0

B

`v`

C

`sqrt(2v)`

D

`sqrt(1.5v)`

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The correct Answer is:
D
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