In series with `20 ohm` resitor a `5` henry inductor is placed. To the combination an e.m.f. of `5` volt is applied. What will be the rate of increase of current at `t=0.25 sec`?

A3 H inductor is placed in series with 10 Omega resistor and an emf of 10V is applied to the combination. Find (i) the current at 0.3s, (ii) the rate of increase of current at 0.3s, (iii) the rate at which energy is dissipated as heat at t = 0.3s . (iv) the rate at which energy is stored in the magnetic field at 0.3s. (v) the rate at which energy is delivered by the battery, and (vi) the energy stored when the current has attained steady value.

An inductor of 5 henry and a resistance of 20 ohm are connected in series with a battery of 5 volt. The initial rate of change of current is

An inductor of 2 henry and a resistance of 10 ohms are connected in series with a battery of 5 volts. The initial rate of change of current is

A coil of negligible resistance and inductance 0.02 henry is connected in series with a wire of zero inductance and resistance 12 ohm. An alternaitng e.m.f of 130 volt and 40 Hz is applied. Calculate the current, potential difference across the resistance and the angle of lag.

A coil has inductance of 5 henry and resistance 20 ohm. An e.m.f. of 100 volt is applied to it. What is the energy stored in the magnetic field, when the current has reached its final steady value?

A 20 H inductor is placed in series with 10 W resistor and an emf of 100 V is suddenly applied to the combination. At t = 1 s from t = 1 s from the start, find the rate at which energy is being stored in the magnetic field around the inductor (givne e^(-0.5)=0.61 ).

A 20 H inductor is placed in series with 10 W resistor and an emf of 100 V is suddenly applied to the combination. At t = 1 s from t = 1 s from the start, find the rate at which energy is being stored in the magnetic field around the inductor (givne e^(-0.5)=0.61 ).

An inductor of 20 H and a resistance of 10 Omega , are connected to battery of 5 volt in series, then initial rate of change of current is :-

A 12 Omega resistor and a 0.21 henry inductor are connected in series to an A.C. source operating at 20 volt, 50 cycle/second. What is the phase angle between the current and the source voltage ?