Electro magnetic induction practice · Mixed difficulty

Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen ?

Which of the following is constructed on the principle of electromagnetic induction

A short-circulated coil is placed in a time-varying magnetic field. Electrical power is dissipated due to the current induced in the coil. If the number of turns were to be quadrupled and the wire radius halved, the electrical power dissipated would be

A conductor of length $l$ is kept in a magnetic field of strength $\mathrm{B}$. A current $\mathrm{I}$ passes through the conductor. The force experienced by the conductor is proportional to

A coil is placed in a time varying magnetic field. If the number of turns in the coil were to be halved and the radius of wire doubled, the electrical power dissipated due to the current induced in the coil would be:
(Assume the coil to be short circuited.)

If a magnet is plugged into a coil, then the magnitude of induced emf does not depend upon

The direction of induced current in a conductor when moved in a magnetic field can be determined by

Consider two identical, coaxial circular loops carrying a current i each, circulating in the same direction. If the loops approach each other

A rectangular, a square, a circular and an elliptical loop, all in the $\left( {x - y} \right)$ plane, are moving out of a uniform magnetic field with a constant velocity $\vec V = v\vec i$ . The magnetic field is directed along the negative $z$-axis direction. The induced $emf$, during the passage of these loops, out of the field region, will not remain constant for

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

A coil of $100\,\,turns$ and area $5\,\,square\,\,centimeter$ is placed in a magnetic field $\mathrm{B} = 0.2\,\,T$. The normal to the plane of the coil makes an angle of ${60^0}$ with the direction of the magnetic field. The magnetic flux linked with the coil is

Current in a coil changes from $\mathrm{5}\,\,\mathrm{A}$ to $\mathrm{10}\,\,\mathrm{A}$ in $\mathrm{0}.\mathrm{2}\,\,\mathrm{s}$. If the coefficient of self-induction is $\mathrm{10}\,\,\mathrm{H}$, then the induced emf is

Induced emf in the coil depends upon

Lenz’s law is statement of

A wire of given length is bent in the form of a ring of diameter 2 a having self inductance $(L)$, then $L$ will depend upon following

An infinitely cylinder is kept parallel to an uniform magnetic field $B$ directed along positive $z$ axis. This direction of induced current as seen from the $z$ axis will be

An emf is 15 V is applied in a circuit coil containing 5 H inductance and 10 Ω resistance. The ratio of currents at time $t = \infty$ and t=1 s is

A copper disc of radius $\mathrm{0}\mathrm{.1 m}$ is rotated about its centre with $\mathrm{20}\,\,\mathrm{rev} - {\mathrm{s}^{ - 1}}$ in a uniform magnetic field of $\mathrm{0}\mathrm{.1 T}$ with its plane perpendicular to the field. The emf induced across the radius of the disc is

A total charge ${Q}$ is uniformly distributed over a non-conducting ring of radius ${r}$. There is a time varying magnetic field perpendicular to its plane and changing at the uniform rate of $\frac{{dB}}{{dt}}$. The magnitude of torque experienced by the ring is

If number of turns in primary and secondary coils is increased to two times each, the mutual inductance

A wire of length $1\,\,m$ is moving at a speed of $2\,\,m{s^{ - 1}}$ perpendicular to its length and in a homogenous magnetic field of $0.5\,\,T$. The ends of the wire are joined to a circuit of resistance $6\,\,\mathrm{\Omega }$. The rate at which work is being done to keep the wire moving at constant speed is

The induction coil works on the principle of

Lenz law is based on principle of conservation of

The particle accelerator that uses the phenomenon of electromagnetic induction is the

Assertion : The mutual inductance of two coils is doubled if the self inductance of the primary
or secondary coil is doubled.

Reason : Mutual inductance is proportional to the self inductance of primary and secondary
coils.

$Weber/{m^2}$ is equal to

A rectangular loop of length $2.5 \mathrm{~m}$ and width $2 \mathrm{~m}$ is placed at $60^{\circ}$ to a magnetic field of $4 T.$ The loop is removed from the field in $10 \mathrm{~s}.$ The average emf induced in the loop during this time is:

In an induction coil, the coefficient of mutual inductance is 4H. If current of 5A in the primary coil is cut off $i$ 1/ 1500s, the emf at the terminals of the secondary coil will be

If the coils of a transformer are made up of thick wire, then

Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. the current in