Question

Find the orbital dipole moment in a field of dipoles of radius 20cm and angular velocity of 2m/s(in 10^-22 order)

(a) 64

(b) 76

(c) 54

(d) 78

The question was asked by my college professor while I was bunking the class.

This intriguing question originated from Magnetic Dipole in section Magnetic Forces and Materials of Electromagnetic Theory

Answer 1

Correct answer is (a) 64

To explain: The orbital dipole moment is given by M = 0.5 x eVangx r^2, where e = 1.6 x 10^-19 is the charge of the electron, Vang = 2 and r = 0.2. On substituting, we get M = 0.5 x 1.6 x 10^-19x 2 x 0.2^2= 64 x 10^-22 units.