Self Assessment Quiz

1. A charge q is moving with a uniform velocity . Obtain its Poynting vector  and show that the energy propagates along with the moving charge.

2. A parallel plate capacitor  with circular plates of radius R is being charged at a uniform rate  by current I in an external circuit.  Obtain an expression for the Poynting vector when it is being charged. Calculate the flow of energy through imaginary cylindrical surface defined by the two plates of the capacitor.