Electromagnetic Induction - Electromagnetism - Physics Previous Year Questions

A bar magnet is allowed to fall vertically through a copper coil placed in a horizontal plane. The magnet falls with a net acceleration, is

Consider the situation given in figure. The wire \(A B\) is slid on the fixed rails with a constant velocity. If the wire \(A B\) is replaced by a semicircular wire, the magnitude of the induced current will

A rod of length \(2 \mathrm{~m}\) slides with a speed of \(5 \mathrm{~ms}^{-1}\) on a rectangular conducting frame as shown in figure. There exists a uniform magnetic filed of \(0.04 \mathrm{~T}\) perpendicular to the plane of the figure. If the resistance of the rod is \(3 \Omega\). The current through the rod is

The current in a coil of inductance \(0.2 \mathrm{H}\) changes from \(5 \mathrm{~A}\) to \(2 \mathrm{~A}\) in \(0.5 \mathrm{~s}\). The magnitude of the average induced emf in the coil is

The physical quantity which is measure in the unit of wb \(\mathrm{A}^{-1}\) is

The current following through an inductance coil of self-inductance \(6 \mathrm{~mH}\) at different time instants is as shown. The emf induced between \(t=20 \mathrm{~s}\) and \(t=40 \mathrm{~s}\) is nearly

A long solenoid has 500 turns, when a current of \(2 \mathrm{~A}\) is passed through it, the resulting magnetic flux linked with each turn of the solenoid is \(4 \times 10^{-3} \mathrm{~Wb}\), then self induction of the solenoid is

A magnetic field of flux densiity \(1.0 \mathrm{~Wb} \mathrm{~m}^{-2}\) acts normal to a 80 turn coil of \(0.01 \mathrm{~m}^2\) area. If this coil is removed from the field in \(0.2 \mathrm{~s}\), then the emf induced in it is

A square loop of side \(2 \mathrm{~cm}\) enters a magnetic field with a constant speed of \(2 \mathrm{~cm} \mathrm{~s}^{-1}\) as shown. The front edge enters the field at \(t=0 \mathrm{~s}\). Which of the following graph correctly depicts the induced emf in the loop?

(Take clockwise direction positive)

A metallic rod of length \(1 \mathrm{~m}\) held along east-west direction is allowed to fall down freely. Given horizontal component of earth's magnetic field \(B_H=3 \times 10^{-5} \mathrm{~T}\). the emf induced in the rod at an instant \(t=2 \mathrm{~s}\) after it is released is

(Take, \(g=10 \mathrm{~ms}^{-2}\) )

The current in a coil changes from \(2 \mathrm{~A}\) to \(5 \mathrm{~A}\) in \(0.3 \mathrm{~s}\). The magnitude of emf induced in the coil is \(1.0 \mathrm{~V}\). The value of self-inductance of the coil is

An induced current of 2 A flows through a coil. The resistance of the coil is $10 \Omega$. What is the change in magnetic flux associated with the coil in 1 ms ?

In the figure, a conducting ring of certain resistance is falling towards a current carrying straight long conductor. The ring and conductor are in the same plane. Then, the

A square loop of side length $a$ is moving away from an infinitely long current carrying conductor at a constant speed $v$ as shown. Let $x$ be the instantaneous distance between the long conductor and side $A B$. The mutual inductance $M$ of the square loop-long conductor pair changes with time $t$ according to which of the following graphs?

When a bar magnet is pushed towards the coil, along its axis, as shown in the figure, the galvanometer pointer deflects towards X . When this magnet is pulled away from the coil, the galvanometer pointer