Inductance

The SI unit of coefficient of mutual induction is

The S.I. unit of self-inductance of a coil is 

The circuit arrangement given below shows that when A.C. passes through the coil $A$, the current starts flowing in coil $B$.

Mention the underlying principle involved.

If $0.1\mathrm{ J}$ of energy is stored for the flow of current of $0.2 \mathrm{A}$ in an inductor, then its inductance value is

The self inductance of a long solenoid cannot be increased by

(a) increasing its area of cross section

(b) increasing its length

(c) changing the medium with greater permeability

(d) increasing the number of turns in it

(e) increasing the current through it

The current through a coil of self-inductance L=2mH is given by $i=t^2{e}^{-t}$ at time t. How long it will take to make the emf zero?

When current in coil changes from $5 \mathrm{A}$ to $2 \mathrm{A}$ in $0.1 \mathrm{s}$, an average of $50 \mathrm{V}$ is produced. The self-inductance in $\mathrm{Henry}\left(\mathrm{H}\right)$ of the coil is $\frac{n}{3}$. Write the value of $n$.

In the figure magnetic energy$\left(\text{in} \mathrm{J}\right)$ stored in the coil is:

A $50 \mathrm{mH}$ coil carries a current of $2 \mathrm{A}$, the energy stored in $\mathrm{J}$ is

Radii of two conducting circular loops are $b$ and $a$ respectively, where $b\gg a$. Centres of both loops coincide but planes of both loops are perpendicular to each other. The value of mutual inductance for these loops

What will be the self-inductance of a coil of $100$ turns if a current $5 \mathrm{A}$ produces a magnetic flux $5\times {10}^{-5}\mathrm{ }\mathrm{Wb}$?

Why is the induced emf in a DC motor also called as the back emf?

The phenomenon due to which there is an induced current in one coil due to the current in a neighbouring coil is:

The self-inductance of a long solenoid carrying current is independent of:

What is meant by back emf in a motor?

Consider two solenoids $A$ and $B$ such that $L_A=2\mathit{ }{L}_{\mathit{B}}$ and $A_A=\frac{1}{2}{A}_B,$ where $L_A, A_A$ and $L_{\mathit{B}}, A_{\mathit{B}}$ are the length and area of the two solenoids respectively. If the magnetic energy stored in the both solenoids is same. What should be the ratio of their magnetic fields $\frac{B_A}{B_B}=$

The S.I unit of inductance is

Two coils are placed close to each other. The mutual inductance of the pair of coils depends upon

A current is flowing through a thin cylindrical shell of radius $R\mathit{.}$ If energy density in the medium, due to magnetic field, at a distance $r$ from the axis of the shell is equal to $U$ then which of the following graphs is correct