Question

The resistance per meter length of a wire is 10 ohm. If the resistivity of the material of the wire is
50x10^-8 ohm meter. Find the area of cross-section of the wire.​

Answer 1

Explanation:

We know that,

R = pl/A ---1

Given that, R = 10 Ohm

p = 50 × 10^-8

l = 1 m.

A = ?.

We get, Ra= pl ----( From 1 )

( 10 )A = (50 × 10^-8) × 1

10A = 50× 10^-8

A = 50 × 10^-8/10

= 50 × 10^-9 m2