A hollow metal sphere of radius R is uniformly charged. The electric field due to the sphere at ?
(a) increases as r increases for r < R and for r > R
(b) zero as r increases for r < R, decreases as r increases for r > R
(c) zero as r increases for r < R, increases as r increases for r > R
(d) decreases as r increases for r < R and for r > R
Answer : (b) zero as r increases for r < R, decreases as r increases for r > R
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