An ideal LC circuit is created by first fully charging a capacitor so the voltage drop across it is V$,$ then connecting the capacitor in series with an inductor and switch. When the switch is closed, the initial magnitude voltage difference across the capacitor is $[$ Select $]["0","$V$/2","$V$"]$ and the magnitude voltage difference across the inductor is $[$ Select $]["0","$V$","$V$/2"].$ As time goes by$,$ the current alternates in direction with a frequency that is $[$ Select $]["$inversely proportional to$",$ "directly proportional to$"]$ the $[$ Select $]["$square root of the capacitance times the inductance", "square of the capacitance times inductance", "capacitance times inductance"$].$