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A hollow insulated conduction sphere is given a positive charge of 10 mC. What will be the electric field at the centre of the sphere if its radius is 2 metres?
(a) Zero
(b) 5 uCm-2
(c) 20 uCm-2
(d) 8 uCm-2
(a)
Charge resides on the outer surface of a conducting hollow sphere of radius R. We consider a spherical surface of radius r < R. By Gauss''s theorem,
i.e., electric field inside a hollow sphere is zero.
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