Average power associated with an ideal inductor and ideal capacitor over a complete cycle of a.c. is respectively

LC series resonant circuit produces resonant frequency ' $f$ '. If ' $L$ ' is tripled and ' $C$ ' is increased by $3 C$, the resonant frequency will be

When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit

An alternating current is given by $\mathrm{I}=100 \sin (50 \pi \mathrm{t})$. How many times will the current become zero in one second?