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A piece of wire of cross-sectional area 2 mm has a resistance of 300 2. Find (a) the resistance of a wire of the

A piece of wire of cross-sectional area 2 mm has a resistance of 300 2. Find (a) the resistance of a wire of the same length and material if the cross-sectional area is 5 mm. (b) the cross-sectional area of a wire of the same length and material of resistance 75022

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