A cylindrical wire is stretched to increase its length by 10%. Calculate the percentage increase in length.
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A cylindrical wire is stretched to increase its length by 10% .the percentage increase in the resistance of the wire will be. So, new C.S Area of extended wire A2 = Pi (r1)^2 = 0.91 Pi r^2. So, new value of resistance = R1 = Rho . { 1.1 l / (0.91 Pi r^2) = Rho . 1.21 l / Pi r^2 .
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