Question

1) Calculate the total resistance
of 2.5×10copper wire if the resistivity of copper at 20°c is 1. 62ohm meter
​

Answer 1

Explanation:

ANSWER

d=10km=10×10

3

meter

d=2.0mm⇒ radius r = 1 mm = 1×10

−3

meter.

⇒ cross sectional area A=πr

2

=π×10

−6

m

2

So resistance R=

A

Pl

=2.7×10

−8

×

π×10

−6

10

4

Ω

⇒R=85.98Ω