An electron moves in a circular orbit of radius R and period T. Step 1: Find the current due to orbital motion The charge of the electron is e (magnitude). In one complete revolution, the charge e passes a given point once in time T. So, current I=‌
e
T
Step 2: Magnetic moment due to a current loop Magnetic moment of a current loop is given by µ=I× area of the loop The area of a circular loop of radius R is A=πR2 Thus, µ=I×A=‌
