Self Assessment Quiz

1. Plates of a parallel plate capacitor, of area A and separation d, have charge densities with the electric field being directed along the y direction.  A small solenoid of radius is placed symmetrically within the capacitor so that its axis is along the z axis. The solenoid carries n turns per unit length and has a current I flowing in its turns. Calculate the  momentum contained in the system, ignoring  fringe effect.

2. A solenoid with n turns per unit length is wound over a non-magnetic core. A current is switched on at time t=0.  The radius of cross section of the solenoid is R. Calculate the amount of momentum stored in a unit length of the solenoid.