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Q.

A hollow charged metal sphere has radius r. If the potential difference between its surface and a point at distance 2r  from the centre is ν, then the electric field intensity at distance 3r  from the centre is

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a

v6 r

b

v4 r

c

v9r

d

2v9 r

answer is D.

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Detailed Solution

V=q4πε01r−12r=14πε012r

E=14πε0q9r2⇒E=2V9r

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