QUESTIONS

If a rate of change of current of $2 {\mathrm{As}}^{-1}$ induces an emf of $10 \mathrm{mV}$ in a solenoid, what is the self-inductance of the solenoid?

The current in a coil increases from zero to $2 \mathrm{A}$ in $0.05 \mathrm{s}$, due to which an induced emf of $80 \mathrm{V}$ is developed. Calculate the coefficient of self-induction of the coil.

The self-inductance of a coil is $10 \mathrm{H}$. Find the rate of change of current in the coil, if an induced emf of $120 \mathrm{V}$ is developed in it.

A coil has a self-inductance of $0.05$ henry. Find magnitude of the emf induced in it when the current flowing through it is changing at the rate $100 {\mathrm{As}}^{-1}$.

A coil has an inductance of $4.0 \mathrm{H}$. Find the emf induced, if a current of $2.7 \mathrm{A}$ in it is stopped within $1-35 \mathrm{s}$.

If the current in the primary coil of a transformer is reduced from $0.5 \mathrm{A}$ to zero in $1 \mathrm{ms}$, an emf of $500 \mathrm{V}$ is induced across the secondary. Calculate the coefficient of mutual induction $\mathrm{M}$.

The current in the primary of a transformer drops from $5$ to $3 \mathrm{A}$ in $2 \mathrm{s}$. If the mutual inductance between the two coils is $0.16 \mathrm{H}$, then calculate the induced emf in the secondary.

The mutual inductance between two coils is $0.15 \mathrm{H}$. If a current of $20 \mathrm{A}$ in the primary coil is cut off in $0.05 \mathrm{s}$, find the emf induced in the secondary coil. If the secondary coil has $60$ turns, then find the flux-change in it.