Question

The resistance of a wire of length6.28m and diameter 0.8mm resistance is 5.5ohm and find the specific resistance of a material of wire

Answer 1

R = rho L/A

R = 5.5

Rho = specific resistance- we have to find it

L = 628cm

A = 22/7*0.4*0.4 = 0.5024mm = 0.05cm

Rho = R*A/L

 = 5.5* 0.05/628

 = 5.5 * 0.000079

 = 0.00043ohm.