Question

The resistance of a copper wire 200 meters long is 21 ohm. If it's thickness is 0.44 CM, calculate the specific resistance in micro ohm meter

Answer 1

Explanation:

The resistance of a copper wire L= 200 meters

Resistance is 21 ohm.

If it's thickness is 0.44 CM,

specific resistance in micro ohm meter is rho

R = (rho * L)/A

A = (π d^2)/4

A= 22/7*(0.44)^2/4

A=0.152 *10^-4

rho =( R*A) /L

rho =( 21 *0.152*10^-4 )/200

rho = 0.01596 *10^ -4

rho = 1.596 micro

ohm meter