Question

Calculate the resistance of copper wire of length 2m and area of cross section is 10 to the power -6 resistivity of the copper is 1.7×10 to the power -8

Answer 1

R = rl/A where R is resistance r is the resistivity l is the length and A is the area of crossection of the wire.

R = 1.7×10^-8 × 2/ 10^-6
= 3.4 × 10-2 ohms