Question

find the resistance of a wire of length 5m resistivity 4×10^minus 6 ohm meter and area 0.001mm^2​

Answer 1

Explanation:

Given

l = 5 cm

p (rho) = 4*10^-6 oh m

A = 0.001 mm^2

= 0.000001 m^2

By applying formula

R= p*l/A

R= 4*10^-6* 5 / 0.000001

R= 4*5 * 10^-6 *10^6

R= 20 ohm ( 10^6 and 10^-6 cancel each other)

I hope it is correct.