Question

a wire 1.0 m long , 0.2 mm in diameter , has a resistance of 10 ohm .calculate the resistivity of its material.

Answer 1

Explanation:

l= 1m

d = 0.2 mm = 0.2 ×10^-3m

r= 0.1× 10^-3m

rho= R×A/ l

rho = 10×.1×10^-3/ 1

resistivity = 10^-3 rho