List of top Physics Questions on Electromagnetic induction

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

The number of slip rings in a simple AC generator is \dots

In Faraday-Henry's experiment, a coil is connected to a galvanometer. For the deflection of pointer in the galvanometer, which of the following statement/s is/are WRONG?
The pointer in the galvanometer deflects -
(a) When the bar magnet is moved towards the stationary coil along its axis
(b) When the bar magnet is moved away from the stationary coil along its axis
(c) When the coil is moved towards the stationary bar magnet along its axis
(d) When the coil and the magnet are moved without relative motion between them

Variation of photoelectric current with anode potential is shown below. Choose the correct option (V\(_0\) = stopping potential).

If \( S_1 \) is closed and \( S_2 \) open, \( \theta \) is 30° and if \( S_1 \) is open and \( S_2 \) closed then \( \theta \) is 60°. Then find \( 3L_2 - L_1 \), if \( C = 100 \mu F \).

Side of square is \( L \) and \( R \ll L \).
Find mutual inductance of the system shown in the figure.

A coil has $N$ turns and current passes through it is $I$ ampere then we obtain $L$ of self inductance. Now if current is made doubled then new self inductance be ______ H.

Two concentric circular coils, one of small radius $r_1$ and the other of large radius $r_2$, such that $r_1 \ll r_2$, are placed co-axially with centres coinciding. The mutual inductance $M$ of the arrangement is proportional to ______.

A circular loop of radius 7 cm is placed in uniform magnetic field of 0.2 T directed perpendicular to plane of loop. The loop is converted into a square loop in 0.5 s. The EMF induced in the loop is ___ mV.

A spherical body of radius $r$ and density $\sigma$ falls freely through a viscous liquid having density $\rho$ and viscosity $\eta$ and attains a terminal velocity $v_0$. Estimated maximum error in the quantity $\eta$ is : (Ignore errors associated with $\sigma$, $\rho$ and $g$, gravitational acceleration)

If \(\varepsilon_0\), \(E\) and \(t\) represent the free space permittivity, electric field and time respectively, then the unit of \[ \frac{\varepsilon_0 E}{t} \] will be

A rod of mass \(m\) and length \(L\) is released on a rail placed in a uniform magnetic field \(B\) as shown. The circuit has resistance \(R\). What will be the terminal velocity of the rod? v

Figure shows the circuit that contains three resistances (\(9\,\Omega\) each) and two inductors (\(4\,\text{mH}\) each). The reading of ammeter at the moment switch \(K\) is turned ON, is _________ A.

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: