A variable capacitor and an inductive coil with negligible resistance are connected in series to an A.C. voltage of value `100V`. The current in the circuit is `5A`. When the capacitor decreases to half its value, the current becomes `10A`. The voltage across the capacitor, in first case, is

A coil of inductance 5.0 mH and negligible resistance is connected to an alternating voltage V=10 sin (100t) . The peak current in the circuit will be:

A coil of inductance 5.0 mH and negligible resistance is connected to an alternating voltage V=10 sin (100t) . The peak current in the circuit will be:

An inductance of 0.5 H,a capacitor of capacitance 10^-9 F and a resistance of 100 Omega are connected in series across A.C. source of e.m.f. 10 V.The current through the circuit at resonance is

A capacitor of capacitance C is given charge Q and then connected in parallel to a coil of inductance L. There is no resitance in the circuit. When the charge on the capacitor becomes zero, the current in the coil will be

A capacitor of unknown capacitance, a coil of inductance L , and a resistor of re- sistance R are connected to a source of a.c. voltage E=e_(0) cos omegat (Fig. 112). The current in the circuit is I = (E_(0)//R) cos omegat . Determine the amplitude U0 of the voltage across the capacitor plates.

A diode is connected to 220V (r.m.s) a.c. in series with a capacitor as shown in the figure. What is the voltage V across the capacitor is

A capacitor, a resistor and a 40 mH inductor are connected in series to an a.c. source of frequency 60 Hz. Calculate the capacitance of the capacitor,if current is in phase with the voltage.

A capacitor, a resistor and a 40 mH inductor are connected in series to an a.c. source of frequency 60 Hz. Calculate the capacitance of the capacitor,if current is in phase with the voltage.

A resistor and a capacitor are connected in series with an a.c. source. If the potential drop across the capacitor is 5 V and that across resistor is 12 V, the applied voltage is