Electromagnetic Induction

A uniform coil of self-inductance $1.8 \times 10^{-4} \mathrm{H}$ and resistance $6 \Omega$ is broken up into two identical coils. These two coils are then connected in parallel across a $12 \mathrm{~V}$ battery. The…

Assertion: A metallic surface is moved in and moved out in a magnetic field, then emf is induced in it. Reason : Eddy current will be produced in a metallic surface moving in and out of magnetic field.

Assertion : Only a change in magnetic flux will maintain an induced current in the coil. Reason : The presence of large magnetic flux through a coil maintains a current in the coil if the circuit is continuous.

Two identical circular coils $A$ and $B$ are kept on a horizontal tube side by side without touching each other. If the current in the coil $A$ increases with time, in response, the coil $B$

A circular ring of diameter $20 \mathrm{~cm}$ has a resistance of $0.01 \Omega$. The charge that will flow through the ring if it is turned from a position perpendicular to a uniform magnetic field of $2.0 \mathrm{~T}$…

A circular coil of radius $10 \mathrm{~cm}, 500$ turns and resistance $2 \Omega$ is placed with its plane perpendicular to the horizontal component of the earth's magnetic field. It is rotated about its vertical…

For MRI, a patient is slowly pushed in a time of $10 \mathrm{~s}$ within the coils of the magnet where magnetic field is $B=2.0 \mathrm{~T}$. If the patient's trunk is $0.8 \mathrm{~m}$ in circumference, the induced emf…

Assertion : An emf $\varepsilon$ is induced in a closed loop when magnetic flux is varied. The induced electric field $E$ is not a conservative field. Reason : The line integral $\oint \vec{E} \cdot \overrightarrow{d…

Mutual inductance of two coils can be increased by

The self inductance of a coil having 400 turns is $10 \mathrm{mH}$. The magnetic flux through the cross section of the coil corresponding to current $2 \mathrm{~mA}$ is

Two conducting circular loops of radii $R_1$ and $R_2$ are placed in the same plane with their centres coinciding. If $R_1>R_2$, the mutual inductance $M$ between them will be directly proportional to

Two solenoids of equal number of turns having their length and the radii in the same ratio $1: 2$. The ratio of their self-inductance will be