the electrical resistance of a wire varies inversely as the square of the radius.if the resistance is 0.24ohms the radius is 0.05. Find the resistance when the radius is 0.04. Solve using variation

Answer 1

R = k/r^2
when R = .24, r = .05
.24 = k/.0025
k = .006

when r = .04
R = .006(1/.0016) = .375