2) Consider an infinitely long, thick wire of radius a, that carries a total DC current I that is evenly distributed throughout the wire, in the -z-direction, as shown in the figure. The wire has resistance p and length L. a) Calculate total power flow into the wire (Poynting vector). b) Show how much of input power flow, stored in field energy density, changes by time. c) Show how much power dissipated?

2) Consider an infinitely long, thick wire of radius a, that carries a total DC current I that is evenly distributed throughout the wire, in the -z-direction, as shown in the figure. The wire has resistance p and length L. a) Calculate total power flow into the wire (Poynting vector). b) Show how much of input power flow, stored in field energy density, changes by time. c) Show how much power dissipated?