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The resistance of wire of uniform diameter d and length l is R . The resistance of another wire of the same material,

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The resistance of wire of uniform diameter d and length l is R . The resistance of another wire of the same material, but diameter 2d and length 4l will be : 

(a) 2R 

(b) R 

(c) R ⁄ 4 

(d) R ⁄ 2

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1 Answer

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Best answer

Correct option (b)R

Explanation:

From formula for resistance 

In second case, the resistance of another wire in which

Now from equations (1) and (2), R′ = R

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