A potential difference V o is applied to a mercury column in a cylindrical container. The mercury

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A potential difference Vo is applied to a mercury column in a cylindrical container. The mercury is now poured into another cylindrical container of half the radius and the same potential difference Vapplied across the ends. As a result of this change of space, the resistance will be increased

(a) 2 times
(b) 4 times 

(c) 8 times

(d) 16 times

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