Suppose you had an electric charge qe (located at (0,0,a) )and a magnetic monopole qm (located at (0,0,-a)). The field of the electric charge is E=(1/4pe0)(qe/r2)and the field of the magnetic monopole is
B=(µ0/4p)(qm/r2)
(a) prove that the total momentum of the system is zero
(b) prove that the total angular momentum of the system (Lem) is independent of the choice of origin
(c) prove that the total angular momentum (Lem)=-((eg)/c)Z