Question

Calculate the resistance of 100 m long copper wire. The diameter of the wire
is 1 mm, take rhow 1.7 x 10 power -8
ohm m.​

Answer 1

Answer:

resistance = 40.8 ohm

Explanation:

the length = 100m

diameter = 1mm = 0.001m

radius = 0.0002m

area of cross section = 0.00000004π m

resistance =

(1.7 *10^-8 *100)/0.00000004 ohm

=(1.7*10^10 ) /4*10^8 ohm

=(1.7*100)/4 ohm

= 40.8 ohm