Question

The ressistance of a wire formed by 1 cc of copper be 2.46 ohm. The diameter of wire is 0.32 mm, then the specific ressistance of wire will be?

Answer 1

specific resistance or resistivity=RA/L

V=AL

L=V/A=1×10^-6/A

r=0.16×10^-3 m

specific resistance=RA^2/V

=[2.46×π^2×(0.16×10^-3)^2]/[10^-6]

=0.621 ohm m