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?

A coil has a self-inductance of 2 H. When a current of 0.5 A flows through it, the total magnetic flux linked with the coil is:

The mutual inductance between two coils is $1.25\,\,henry$. If the current in the primary changes at the rate of $80\,\,ampere/second$, then the induced e.m.f. in the secondary is

When the current changes from ${\rm{ + 2 A}}$ to ${\rm{ - 2 A}}$ in ${\rm{0}}.{\rm{05}}\,\,{\rm{s}}\,$, an emf of ${\rm{8}}\,{\rm{V}}$ is induced in a coil. The coefficient of self-induction of the coil is

The self inductance of a coil is $L$. Keeping the length and area same, the number of turns in the coil is increased to four times. The self inductance of the coil will now be

A solenoid with $100$ turns per meter carries a current of $2.5$ A. What is the magnetic field inside the solenoid?

Calculate the magnetic energy stored in an inductor with an inductance of $8 \mu H$ when a current of $3 A$ flows through it.

The induced emf of a generator when the flux of poles is doubled and speed is doubled

When the number of turns and the length of the solenoid are doubled keeping the area of cross-section same, the inductance

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 coils $A$ and $B$ having turns ${\rm{300}}$ and ${\rm{600}}$ respectively are placed near each other, on passing a current of $3.0\,\,ampere$ in $A$, the flux linked with $A$ is $1.2\,\, imes {10^{ - 4}}\,weber$ and with $B$ it is $9.0\,\, imes {10^{ - 5}}\,weber$. The mutual inductance of the system is