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A 4Ω resistance wire is doubled on it. Calculate the new resistance of the wire.

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asked Jan 22, 2018 in Physics by Kundan kumar (49,132 points) ● 34 ● 380 ● 1015

A 4Ω resistance wire is doubled on it. Calculate the new resistance of the wire.

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answered Jan 22, 2018 by Vikash Kumar (144,729 points) ● 8 ● 11 ● 21
selected Jan 23, 2018 by Kundan kumar
 
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We are given, R = 4Ω
When a wire is doubled on it, its length would become half and area of cross-section would be doubled. That is, a wire of length l becomes I/2 and area of cross-section 2A.
We know that's

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