A `10 Omega , 20 ` m H coil carrying constant current is connect ed to a battery of 20 V through a switch. Now after switch is opened current becomes zero in `100 mu s` . The average e.m.f induced in the coil is _________V.

A coil of self-inductance 15 H is connected to a battery of 10 V through a 5 Omega resistor and a switch. The switch is suddenly opened in 2 ms. Calculate the average emf induced in the coil.

When current in a coil changes with time, how is the back e.m.f. induced in the coil related to it ?

An inductor of 3H is connected to a battery of emf 6V through a resistance of 100 Omega . Calculate the time constant. What will be the maximum value of current in the circuit ?

A 12 V battery connected ot a 6 Omega, 10 H coil through a switch drives a constant current in the ciructit. The switch is suddenly opened. Assuming that it took 1 ms to open the swith, calculate the average emf induced across the coil.

A capacitor of 2.0 muF is connected to a battery of 2V through a resistance of 10 k Omega . Calculate (i) the initial current in the circuit and (ii) the current after 0.02s.

A 10 V battery connected to 5omega resistance coil having inductance 10 H through a switch drives a constant current in the circuit. The switch is suddenly opened and the time taken to open it is 2ms. The average emf induced across the coil is

A coil of resistance 40 Omega is connected across a 4.0 V battery. 0.10 s after the battery is connected, the current in the coil is 63 mA. Find the inductance of the coil.

A current through a choke coil of self inductance 2H decreases at the rate of 0.5A//s . The e.m.f. developed across the coil is

(a) When the current in a coil changes from 8A to 2A in 3xx10^(-2)s , the emf induced in the coil is 2V . The self-induced of coil in mH (b) A 12V battery conneted to a 6Omega . 10H coil through a switch drives a constant current in the circuit. The switch is suddenly opened. Assuming that it took 1msec to open the switch, calculate the average emf induced across the coil. (c) The equivalent inductance of two inductored in series. What is the value of inductances of the individual inductors? (d) If i=5A and decreasing at a rate of 10^(3) (A/sec), find V_(B)-B_(A) .