Question

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​

Answer 1

Answer:

R = Rho l/a

Rho = 40 * 10^-6 m

R = 40 * 10^-6 * 100 /0.02