Question

A metal wire of resistivity 64 x 10–6 ohm m and length 198cm has a resistance of 7 ohm

Calculate its radius.

step by step solution with explanation please​

Answer 1

Answer:

The answer is 0.00758946572 m

Explanation:

r=pl/a

7=64*10^-6*198/a

7=0.00012672/a

a=0.00012672/7

a=0.00018102857

a=Pi r^2

0.00018102857=22/7 *r^2

0.00018102857*7=22*r^2

0.00126719999=22*r^2

0.00126719999/22=r^2

0.00005759999=r^2

square root on both the sides

0.0075894657 m = r