A toroidal solenoid with $N$ turns and mean radius $r$ carries a current $I$. A single loop of wire is wrapped around the toroid. If the current in the solenoid is changing at a rate $\frac{dI}{dt}$, what is the induced emf in the single loop?

Two inductors of inductance L each are connected in series with opposite magnetic fluxes. What is the resultant inductance? (Ignore mutual inductance)

Two pure inductors each of self inductance $L$ are connected in parallel but are well separated from each other. The total inductance is

In circular coil, when no. of turns is doubled and resistance becomes $\frac{1}{4}th$ of initial, then inductance becomes

A coil of 100 turns and area $0.01 m^2$ is placed perpendicular to a magnetic field of 0.2 T. If the field is reversed in 0.1 seconds, the induced emf in the coil is:

A current $I = 10\,\,\sin \left( {100\,\,\pi t} \right)A$ is passed in first coil, which induces a maximum emf of $5\,\,\pi V$ in second coil. The mutual inductance between the coils is

Lenz's law is a consequence of the law of conservation of:

A long solenoid has $500$ turns and is $1$ m long. If the magnetic field at the center is $2\pi imes 10^{-4}$ T, what is the current flowing through the solenoid?

The magnetic potential energy stored in a certain induction is ${\rm{25}}{\mkern 1mu} {\mkern 1mu} \,mJ$, when the current in the inductors is ${\rm{60}}{\mkern 1mu} {\mkern 1mu} mA$. This inductors is of inductance

The self inductance of a coil is $5\,\,henry$, a current of $1\,\,amp$ change to $2\,\,amp$ within $5\,\,second$ through the coil. The value of induced e.m.f. will be

The current through choke coil increases from zero to $6\,\,A$ in $0.3\,\,seconds$ and an induced e.m.f. of ${\rm{30}}\,\,{\rm{V}}$ is produced. The inductance of the coil of choke is