If the coefficient of mutual induction of primary and secondary of an induction coil is 6 henry and a current of 5 ampere is cut off in 2xx10^-4 s, ind the induced e.m.f. in the secondary coil.

Compute the mutual inductance for a given pair of coils if increase in current from 2 A to 6 A in 0.1 s in one coil causes an induced e.m.f. of 1 V in other coil.

Calculate the mutual inductance between two coils, when a current of 4.0 A changes to 8.0 A in 0.5 s and induces an e.m.f. of 50 mV in the secondary coil.

A long straight wire XY carries a current of 2 amperes. A proton P travels at 5 xx 10^(-6)ms^(-1) parallel to the wire as shown in the diagram, 0*2 m away from it. Find out the magnitude and direction of force which magnetic field exerts on the proton.

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

A square loop of side 10 cm and resistance 0.70 ohm is placed vertically in the east -west plane. A uniform magnetic field of 0.10 T is set up across the plane in north-east direction. The magnetic field is decreased to zero in 0.7 sec. at a steady rate. Determine the magnitudes of induced e.m.f. and current during this time interval.

Current changes in time interval 5 s from 7 A to 2 A in a coil of self inductance 0.1 H. Find the value of induced e.m.f. and the direction of induced current in the coil.

What is electromagnetic induction ? State its laws. Describe the methods for producing induced e.m.f. State the law by which the direction of induced current can be determined.

When an inductor L and resistor R in series are connected across a 12 V , 50 Hz supply a current of 0 . 5 ampere flows in the circuit, the current differes in phase from applied voltage by (pi)/(3) radian. Calculate the value of R

A coil of inductance 0.50 H and resistance 100 ohm is connected to a high frequency supply (240 V, 10 kHz). (a) Obtain the maximum current in the coil. (b) what is the time lag between voltage maximum and the current maximum. Hence, explain the statement that at very high frequency, an inductor in a circuit nearly amounts to an open circuit. How does an inductor behave in a dc circuit after the steady state?