Two coaxial solenoids of radii $r_1$ and $r_2$ ($r_2 > r_1$) have the same length $l$ and the same number of turns $N$. If the current in the outer solenoid changes at a rate of $\frac{dI}{dt}$, what is the induced emf in the inner solenoid?

Two coils are placed close to each other. When the current in the first coil changes, an emf is induced in the second coil. This phenomenon is known as:

An e.m.f. of $100\,\,millivolts$ is induced in a coil when the current in another nearby coil becomes $10\,\,ampere$ from zero in $0.1\,\,second$. The coefficient of mutual induction between the two coils will be

The coefficient of mutual inductance between two coils depends on:

The induction coil works on the principle of

Two identical coils, each of inductance $L$, are connected in series and placed such that their mutual inductance is $M$. If the current in the coils is changing at a rate $\frac{dI}{dt}$, what is the total induced emf across the series combination?

Two coaxial solenoids of radii $r_1$ and $r_2$ ($r_2 > r_1$) have the same length $l$ and the same number of turns $N$. If the current in the outer solenoid changes at a rate of $\frac{dI}{dt}$, what is the induced emf in the inner solenoid?

Two identical coaxial circular coils, each of radius $R$ and $N$ turns, are placed a distance $d$ apart, where $d << R$. A current $I$ flows through both coils in the same direction. A small circular loop of radius $r$ ($r << R$) and resistance $\rho$ is placed coaxially midway between the coils. If the current in the larger coils is now varied at a rate of $\frac{dI}{dt}$, what is the induced current in the small loop?

Two circuits have coefficient of mutual induction of $0.09\,\,henry$. Average e.m.f. induced in the secondary by a change of current from ${\rm{0}}$ to $20\,\,ampere$ in $0.006\,\,second$ in the primary will be

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?