Question

if a copper wire of resistivity 1.6× 10*-8 ohm meter has cross section area of 10.3 ×10*-4 cm*2 calcute the length of wire required to make a 20 ohm resistance​

Answer 1

Answer:

Given,

R=10Ω

A=10×10

−8

m

2

ρ=1.6×10

−8

Ω/m

We know that,

R=ρ

A

l

l=

ρ

RA

=

1.6×10

−8

10×10×10

−8

l=62.5m

The length of wire copper wire is 62.5m