In the series LCR circuit shown in figure, the impedance is

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

The resistance of a coil for d.c. is $5 \Omega$. In a.c., the resistance will

In an oscillating LC circuit, the maximum charge on the capacitor is ' $Q$ '. When the energy is stored equally between the electric and magnetic fields, the instantaneous charge on the capacitor ' $q$ ' is