the resistance and inductance of series circuit are `5Omega` and `20H` respectively. At the instant of closing the switch, the current is increasing at the rate `4A-s`. The supply voltage is

Resistance , inductive reactance and capacitative reactance of an LCR series ac circuit are 30Omega , 60Omega and 20Omega respectively. What is the phase difference between the ac-voltage and current in the circuit?

A series LCR- circuit containing a resistance of 120 Omega has angular resonance frequency 4 xx10^(5) rads^(-1) . At resonance the voltages across resistance and inductance are 60 V and 40 V respectively. Find the values of L and C. At what frequency the current in the circuit lags the voltage by 45^(@) ?

The mutual inductance between a primary and secondary circuit is 0.5H . The resistance of the primary and the secondary circuits are 20 ohms and 5ohms respectvely. To genrate a current of 0.4A in the secondary,current in the primary must be changed at the rate of

The mutual inductance between a primary and secondary circuit is 0.5H . The resistance of the primary and the secondary circuits are 20 ohms and 5ohms respectvely. To genrate a current of 0.4A in the secondary,current in the primary must be changed at the rate of

A coil of resistance 20Omega and inductance 0.5H is switched to DC200V supply. Calculate the rate of increase of current a. at the instant of closing the switch and b. after one time constant. c. Find the steady state current in the circuit.

A coil of resistance 20Omega and inductance 0.5H is switched to DC200V supply. Calculate the rate of increase of current a. at the instant of closing the switch and b. after one time constant. c. Find the steady state current in the circuit.

A coil of resistance 20Omega and inductance 0.5H is switched to DC200V supply. Calculate the rate of increase of current a. at the instant of closing the switch and b. after one time constant. c. Find the steady state current in the circuit.