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why of length 15 cm is 10 resistance in a circuit find the resistance of a wire if the wire is stretched to double its length the wire is doubled on itself?
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?why of length 15 cm is 10 resistance in a circuit find the resistance...
If the wire is stretched to double its length then its length increases by 2 times and its area decreases by 2 times

R resistance is d proportional to l/A
Hence resistance increases by 4 times.

Hence R = 40 ohm.

If the wire is double on itself then resistance becomes 10/4 = 2.5 ohm

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