An LC oscillator circuit has an inductance of l = 1 ml henry a capacitor with a capacitance of 0.1 microfarads performs electromagnetic oscillations with a current of I = 6 x 10^-3 amperes, then the charge of the capacitor is q = 8 x 10^-8 coulombs at t = 0, the magnetic field energy is equal to the electric field energy and the capacitor's charge is greater than 0 but is decreasing from the capacitor's charge expression: