18 In the figure the capacitor is fully charged when switch

18

In the figure, the capacitor is fully charged when switch S is c time t= 0, Which of the following plots describes the energy stored by the capacitor (Uc) and inductor (UL) as a function of time? Figure B gure F Figure A Figure C Figure E Figure D O O O Figure A Figure B Figure C

Solution

It would be figure B.t

he energy of the LC circuit continuously oscillates between energy stored in the electric field of the capacitor and energy stored in the magnetic field of the inductor. When the energy stored in the capacitor has its maximum value Qmax2/2C, the energy stored in the inductor is zero. When the energy stored in the inductor has its maximum value ½ LImax2 the energy stored in the capacitor is zero.