An inductor used in a dc power supply has an inductance of 12.0 H and a resistance of 180 O. It carries a current of 0.300 A.
(a) What is the energy stored in the magnetic field?
(b) At what rate is thermal energy developed in the inductor?
(c) Does your answer to part (b) mean that the magnetic-field energy is decreasing with time? Explain.