Year: 2015
Topic: Moving charges and magnetism
Time :
1. An electron moving in a circular orbit of radius r makes n rotations per second. The magnetic field produced at the centre has magnitude
(1). \(\displaystyle\frac{µ_0n^2e}{r}\)
(2). \(\displaystyle\frac{µ_0ne}{2r}\)
(3). \(\displaystyle\frac{µ_0ne}{2πr}\)
(4). \(Zero\)