List of top Physics Questions on Electromagnetic induction

A light copper ring is freely suspended by a light string. A bar magnet is held horizontally with its length along the axis of the ring. The magnet is moved towards the ring with its N pole facing the loop. What will happen to the ring and its position? Explain.

A square loop of side 0.50 m is placed in a uniform magnetic field of 0.4 T perpendicular to the plane of the loop. The loop is rotated through an angle of 60° in 0.2 s. The value of emf induced in the loop will be:

A long solenoid of length \( L \) and radius \( r_1 \) having \( N_1 \) turns is surrounded symmetrically by a coil of radius \( r_2 \, (r_2>r_1) \) having \( N_2 \) turns (\( N_2 \ll N_1 \)) around its mid-point. Derive an expression for the mutual inductance of solenoid and coil. Is \( M_{12} = M_{21} \) valid in this case?

A plane circular coil is rotated about its vertical diameter with a constant angular speed \( \omega \) in a uniform horizontal magnetic field. Initially the plane of the coil is parallel to the magnetic field. Draw plots showing the variation of the following physical quantities as a function of \( \omega t \), where \( t \) represents time elapsed: Magnetic flux \( \phi \) linked with the coil, and emf induced in the coil.

Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

A rectangular loop of size 5 cm × 8 cm is lying in x-y plane in a uniform magnetic field \(\vec{B} = (2.0 \text{ T}) \hat{k}\). The total magnetic flux linked with the loop is:

If the current passing through a coil of self-inductance \(50\) mH having \(50\) turns is \(5\) A, then the magnetic flux linked with the coil (in \(10^{-3}\) Wb) is

What are the Faraday\'s laws of electromagnetic induction? The magnetic flux linked with a coil of resistance \(2\ \Omega\) is \[ \phi = (5t^{3} - 100t + 300)\ \text{Weber} \] Find out: (i) induced e.m.f. produced in the coil at \(t = 2\) seconds (ii) induced current in the coil.
OR
Explain the conditions required for the resonance in series LCR alternating circuit by the diagram. On which factors does the resonant frequency depend?

Figure shows a rectangular loop being pulled out of a magnetic field \( B \) with a velocity \( v \) by applying an external force \( F \). Find the amount of magnetic force induced on the loop and show its direction.

Write the unit of self-inductance.

What do you mean by eddy current? How does it affect the energy losses? Write the uses of eddy current.

What do you understand by electromagnetic induction? State the Faraday's laws of electromagnetic induction.
OR
Obtain the formula for the capacitance of a parallel plate capacitor when a dielectric medium is partially filled between its plates.

What is meant by mutual inductance? Define coefficient of mutual inductance and write its unit.

The INCORRECT statement is

The mutual inductance between a pair of coils is 3 H. If the current in one coil changes from 0 A to 2 A in 0.5 s, the induced emf produced in the other coil is

પરિમિત પ્રતિરોધવાળું એક વાહક લૂપ \( x-y \) પ્લેન પર આવેલું છે. લૂપનું ક્ષેત્રફળ સમય \( t \) સાથે \( A = A_0(1 + \sin t) \) પ્રમાણે બદલાય છે. લૂપમાં વિસર્જિત થતી પાવરના સમય સાથેના ગુણાત્મક વ્યવહારને સાચી રીતે દર્શાવતો આકૃતિ છે:

The magnetic energy stored per unit volume in a solenoid with 1000 turns per metre carrying a current of 0.7 A is:

The magnetic flux linked with a coil varies as $\phi = 2.5t^2 + 5t + 7$ (t in s). If the induced electric power at t = 3 s is 2 W, then the power at t = 5 s is:

The permeability of the material of the core used in a solenoid of length 1.4 m, radius 7 cm having $10^3$ turns and a self-inductance of 2.2 H is

Two parallel wires \(AL\) and \(BM\), placed at a distance \(l\), are connected by a resistor \(R\) and placed in a magnetic field \(B\) perpendicular to the plane of the wires. Another wire \(CD\) connects the two wires perpendicularly and is made to slide with velocity \(v\). Neglect the resistance of all the wires. What is the work done per second needed to slide the wire \(CD\)?

If a conducting rod of length $100\text{ cm}$ rotates about one of its ends with a constant frequency of $14\text{ revolutions per second}$ in a plane perpendicular to a uniform magnetic field of $2\text{ T}$, then the induced emf between the two ends of the rod is:

Magnetic flux of a $20$ turn coil is reduced to zero from $0.3\,Wb$ in one second. The induced e.m.f. between the terminals of the coil is

Induction stove works on the main principle of \dots