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  4. A hollow metal sphere of radius 5 cm is charged such that potential at its surface is 10 V . The potential at the centre of the sphere is

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Q. A hollow metal sphere of radius $ 5\,cm $ is charged such that potential at its surface is $ 10\,V $ . The potential at the centre of the sphere is

J & K CETJ & K CET 2003

Solution:

Electric field inside a spherical charge is everywhere zero, hence, inside a spherical charge the potential at all points is the same and its value is equal to that on the surface.
$ \therefore $ Potential at surface $ =10\,V. $

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