일반물리학 2 — Electromagnetic Oscillations and Alternating Current: Problem 64

64 The frequency of oscillation of a certain $LC$ circuit is $220 \text{ kHz}$. At time $t = 0$, plate $A$ of the capacitor has maximum positive charge. At what earliest time $t > 0$ will (a) plate $A$ again have maximum positive charge, (b) the other plate of the capacitor have maximum positive charge, and (c) the inductor have maximum magnetic field?