Find out Resistance of a copper wire which diameter 2 mm and length 2 m

 

Data:

L=2 m

d= 2 mm 

R= ?

Resistance of copper = 1.69 * 10^-8 ohm meter 

A=resistance of copper * 3.14 * d^2 / 4

                                     

 

Solution:

                        R = resistance of copper * L / A

By putting vales                R = 1.69 * 10^-8 ohm meter * 2 meter / 3.14 * 10^-6 meter*meter

 

                                           R =  1 * 10^-2 ohm

ohm is a unit of Resistance