Question

Resistance of a metal wire of length 1 m to having diameter 0.3 mm. What will be the resistivity of the metal? ​

Answer 1

Answer:

R {(7.065) x 10^ -8}

Explanation:

r = d/2 = 0.3 mm / 2 = 3x10^ -4 / 2

r = 1.5*10^ -4 m

R = ρl / A

ρ = RA / l

= R ( πr^2) / l

= R ( π *(1.5*10 ^ -4) ^2 ) / 1

= R {(7.065) x 10^ -8}