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

Why self-induction is called the inertia of electricity?

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 $5\times {10}^{-5}\mathrm{ }\mathrm{Wb}$?

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

The current through a $4.6 \mathrm{H}$ inductor is shown in the following graph. The induced emf during the time interval $t=5$ $\mathrm{m} \mathrm{s}$ to $6$ $\mathrm{m} \mathrm{s}$ will be

Assertion: A spark occurs sometime, when an electric iron is switched off.

Reason: Sparking is due to large self-induced $\mathrm{emf}$ in the circuit during the circuit break.

Two co-axial solenoids are made by winding thin insulated wire over a pipe of cross-sectional area $\mathrm{A}=10\mathrm{ }{\mathrm{c}\mathrm{m}}^2$ and length $l=20\mathrm{ }\mathrm{c}\mathrm{m}.$ If one of the solenoids has $300\mathrm{ }\mathrm{t}\mathrm{u}\mathrm{r}\mathrm{n}\mathrm{s}$ and the other $400\mathrm{ }\mathrm{t}\mathrm{u}\mathrm{r}\mathrm{n}\mathrm{s}$, their mutual-inductance is $\left({\mathrm{\mu }}_0=4\mathrm{\pi }\times {10}^{-7} \mathrm{T}\mathrm{ }\mathrm{m}\mathrm{ }{\mathrm{A}}^{-1}\right)$

In $0.1 \mathrm{s}$, the current in a coil increases from $1 \mathrm{A}$ to $1.5 \mathrm{A}$. If inductance of coil is $60 \mathrm{mH}$, then induced current in external resistance of $3 \mathrm{\Omega }$ will be