Question

The ratio of the orbital dipole moment to the orbital angular moment is given by

(a) e/m

(b) –e/m

(c) e/2m

(d) –e/2m

I got this question in an online quiz.

This question is from Magnetic Dipole in division Magnetic Forces and Materials of Electromagnetic Theory

Answer 1

Right choice is (d) –e/2m

To explain I would say: The orbital dipole moment is given by M = 0.5 x eVangx r^2 and the orbital angular moment is given by Ma = m x Vangx r^2. Their ratio M/Ma is given by –e/2m, the negative sign indicates the charge of electron.