An electron is allowed to rotate on a metallic circle of the perimeter of 20 π made from copper wire of resistance 0.0171 Ω per unit length and rotates with speed 15 m/s, what will be the potential difference per unit length of the circle
1
6.53× 10-22V
2
3 V
3
5× 10-21V
4
6× 10-21