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The resistance of a conductor is

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inversely proportional to the square of the radius

inversely proportional to the length

directly proportional to the square of the radius

directly proportional to the square root of the length

answer is C.

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Detailed Solution

$R = ρ \frac{l}{A}$

Since area is proportional to the square of radius, resistance is inversely proportional to the square of radius.

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