The length of a copper wire is tripled by stretching it. Compare it's initial and final resistivity.
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The resistance of a wire is r if the length of the wire is doubled then its resistance will be
R′=ρA2L. So, R = 2R'. Hence, If the length of a wire is doubled, then its resistance becomes 2 times
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twice because from formula we can get R=rl/a
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