Question

A resistor of 100 ohms is made of a wire of a length of 20m. The cross section of the wire is in the shape of a circle with a radius of 0.35 cm, Then the resistivity of the material of the wire is ___.​

Answer 1

Answer:

0.0001925

Explanation:

R=100 ohms

l=20m

r=0.35cm

area of cross section=pi*r^2

                                  =22/7*((0.35/100)^2)      since r is in cm

                                   =0.0000385 m^2

as we know....

resistivity=(A*R)/l

               =(0.0000385*100)/20

               =0.00385/20

               =0.0001925      <----ANSWER