how does the resistance of the conductor changes when a wire is stretched to twice its length
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Explanation:
If the original length of the wire is l and its cross-sectional area is A, then its resistance, R=ρl/A. When the length becomes 2l, cross-sectional area reduces to A/2 because volume of the wire does not change. Changes resistance, R′=ρ(2l)(A/2)=4ρlA=4R.
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