A wire is doubled on it. What will be it's new resistance.
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Explanation:
The resistance R is directly proportional to lenght of a wire and inversely proportional to it's cross sectional area. Therefore, If the length of the wire is stretched uniformly to 2 times its original length, then the cross-sectional area is reduced to 1/2 times because the volume ( V = AL) remains the same.
Since the resistivity of the material constant, thus calculate the resistance of the wire.
Hence, resistance of the wire increased by 4 times.
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