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20 November, 09:15

A wire of length L m has 2 ohms resistance. It is stretched twice its original length and its area becomes half of its original area. What is its new resistance?

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  1. 20 November, 09:40
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    As a wire gets longer its resistance increases, and as it gets thinner its resistance also 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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