a wire of length 1m and resistance is stretched so that its length double and the area of cross section is half how will its resistance change and resistivity?
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As a wire gets longer its resistance increases, and as it gets thinner its resistancealso increases because its cross sectional area decreases. Doubling the length will double the resistance, but the wire also must get thinner as it is stretched, because it will contain the same amount of metal in twice the length.
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