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A charge of +1C is placed at the centre ...

A charge of +1C is placed at the centre of a spherical shell of radius 10cm. What will be the work done in moving a charge of `+1muC` on its surface through a distance of 5cm?

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Since, the surface of spherical shell will be an equipotential surface due to charge of +1C. So, the work done on this surface will be zero.
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