A wire of length l and resistance r is stretched so that its length is doubled and the area of cross-section is half.how will its resistivity change and its resistance change.
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Resistivity will always remain constant like mass of a body.(It changes only for temperature change.)
Resistance will become 4 times
R = p (L/2)/(A/2)
=4pL/A
Resistance will become 4 times
R = p (L/2)/(A/2)
=4pL/A
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