calculate the resistance of copper wire 2m diameter is 4 mm whose resistivity is 1.8×10^-8ohm
Answers
Answer:
0.9 X 10^-5 ohm
Explanation:
The formula for resistance of wire is R=rho * L/A where,rho=resistivity of wire, L=length of wire, A=area of cross section of wire. so, given,rho=1.8 x 10^-8 ohm ; l=2 m ; A=4 mm=4 x 10^-3 m substitute the values in the equation,we get R=1.8 x 10^-8 ohm X 2 m /(4*10^-3 m) on solving we get R=0.9 X 10^-5 ohm