Question

example 5: Determine the resistance of a copper wire having a length of l km and
It diameter of 0.5 mm​

Answer 1

Answer:

85 m

Step-by-step explanation:

p =resistivity copper = 1.7 x10³m

converting all measure into metre

L=1km=1000m=10³m

d=0.5mm=0.5x10-³m

if r is radius of wire then, its area of cross section

A=πr²

A=πxd²/2

π(0.5x10-³)²m

R=(1.7x10³πmx10³m)

85m