Find the capacity of a condenser to run a 30 Volt, 10 watt lamp when connected in series with an alternating e.m.f. of 220 volt and frequency `50 c//s`

A coil has an inductance of 0.7 H and is joined in series with a resistance of 220 ohm. Find the wattless component of current in the circuit, when an alternating e.m.f. of 220 V at a frequency of 50 Hz is supplied to it.

A 25 watt, 220 volt bulb and a 100 watt, 220 volt bulb are connected in series across 440 volt line

Condensers of capacities 5F and 10F are connected in parallel in a circuit with a cell of e.m.f. 2V. The capacity of the condenser to be connected in series with parallel combination of the condensers to get 1C charge to flow in the circuit is

A condenser of 10muF and an inductor of 1.2H are connected in series with an A.C. source of frequency 50Hz . The impedance of the combination will be

What will happen when a 40 watt 220 volt lamp and 100 watt-220 volt lamp are connected in series across 40 volt supply?

When a galvanometer having 30 divisions scale and 100Omega resistance is connected in series with the battery of e.m.f. 3 volt through a resistance of 200Omega , it shows full scale deflection. Find the figure of merit of the galvanometer in microampere.

A potentiometer wire of length 1000 cm has a resistance of 10 ohms. It is connected in series with a resistance and a cell of e.m.f 2 volts and of negligible internal resistance. A source of e.m.f 10 millivolts is balanced against a length of 40 cm of the potentiometer wire. What is the value of the external resistance?

Two condensers of 20 and 30 microfarads are connected in series across a 200volt D.C. supply. Find the charge on each condenser ?