Self and Mutual Induction
Important Questions on Self and Mutual Induction
A long solenoid has turns. When a current of is passed through it, the resulting magnetic flux linked with each turn of the solenoid is Wb. The self-inductance of the solenoid is

Two conducting loops of radi and are concentric and are placed in the same plane. If , the mutual inductance M between them will be directly proportional to-

Energy is stored in the choke coil in the form of-

The equivalent inductance of two inductances is when connected in parallel and when connected in series. The difference between the two inductances is

The mutual inductance of two coils when magnetic flux changes by and current changes by is :-

The magnetic potential energy stored in a certain inductor is when the current in the inductor is This inductor is of inductance :-

A small square loop of wire of side is placed inside a large square loop of wire of side . The loops are coplanar and their centres coincide. The mutual inductance of the system is proportional to

The mutual inductance between a primary and secondary circuits is . The resistance of the primary and the secondary circuits are and respectively. To generate a current of in the secondary, current in the primary must be changed at the rate of

The current (I) in the inductor is varying with time according to the plot shown in figure.
Which one of the following is the correct variation of voltage with time in the coil ?

A current time curve is shown in the following diagram. This type of current is passed in the primary coil of transformer. The nature of induced emf in the secondary coil will be :-

Two co-axial solenoids shown in figure. If key of primary suddenly opened then direction of instantaneous induced current in resistance ‘R’ which connected in secondary:

Pure inductors each of inductance 3 H are connected as shown. The equivalent induction of the circuit is :-

Assertion : The coils in the resistance boxes are made by doubling the wire.
Reason : When two coils are wound on each other, the mutual inductance is zero.

Assertion : Self-inductance is called the inertia of electricity.
Reason : In a LR circuit, the inductor opposes any change in current.

An inductor , a resistor (), and a battery are initially connected in series as shown in the figure. After a long time, the battery is disconnected after short-circuiting points and . The current in the circuit after the short circuit is :

The bob of a simple pendulum is replaced by a magnet. The oscillation are set along the length of the magnet. A copper coil is added so that one pole of the magnet passes in and out of the coil. The coil is shortcircuited. Then which of the following happens ?

In circuit emf of cell, . Work done in changing current from to is:-

Find self inductance (in henry) of a solenoid of length , total turns and area which is filled with a medium of relative permeability, .

A wire has length , radius and . Find its self-inductance.

Find the dimensions of inductance.

