calculate the resistanc of a 100m length of wire having a cross sectional area of 0.02m and resistivity of 40u ohm cm. If the wire drawn out to 4times its original length calculate it's new resistance
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R = Rho l/a
Rho = 40 * 10^-6 m
R = 40 * 10^-6 * 100 /0.02
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