on stretching length of a conductor wire is doubled what will change is be in its resistance and resistivity
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It is directly proportional to the length and inversely proportional to diameter. When the conductor is stretched, the diameter decreases and the length increase increasing resistivity. So the resistivity will also triple.Feb 22, 2018
Explanation:
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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