List of top Physics Questions on Electromagnetism

When the magnet as shown in the diagram, is moved towards the coil at a speed of 5 ms$^{-1}$, the galvanometer shows a certain deflection to the right.

How will the direction and magnitude of deflection change when the coil also moves with a speed of 5 ms$^{-1}$:
(a) in the direction of the motion of the magnet?
(b) in the opposite direction of the motion of the magnet?

In an AC generator, name the part which has the following functions:
(a) intensifies the magnetic field.
(b) maintains electrical contact between the rotating parts and the external circuit.

The diagram below shows the top view of the Wire A shown by a cross (X) carrying current into the plane of the paper. Which of the compasses is correctly aligned with the magnetic field, produced by the current carrying wire?

Six vectors $ \vec{a},\vec{b},\vec{c},\vec{d},\vec{e},\vec{f} $ have magnitudes and directions shown. Which statement is true?

A particle of charge $ q $ and mass $ m $ moves in a circular orbit of radius $ r $ with angular speed $ \omega $. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on

An ideal solenoid is kept with its axis vertical. Current $ I_0 $ is flowing in the solenoid. A charge $ Q $ is thrown downward inside the solenoid. If acceleration of the charge particle is $ a $, then

An ideal solenoid is kept with its axis vertical. A current $ I_0 $ is flowing in the solenoid. A charge $ q $ is thrown vertically downward inside the solenoid. The acceleration of the charged particle is:

A rectangular coil of area A is kept in a uniform magnetic field $\vec{B}$ such that the plane of the coil makes an angle $\alpha$ with $\vec{B}$. The magnetic flux linked with the coil is:

Assertion (A): A charged particle is moving with velocity $ v $ in $ x $-$ y $ plane, making an angle $ \theta $ ($ 0<\theta<90^\circ $) with $ x $-axis. If a uniform magnetic field is applied in the region, along $ y $-axis, the particle will move in a helical path with its axis parallel to $ x $-axis.
Reason (R): The direction of the magnetic force acting on a charged particle moving in a magnetic field is along the velocity of the particle.

(i) Write Biot-Savart's law in vector form.
(ii) Two identical circular coils A and B, each of radius $ R $, carrying currents $ I $ and $ \sqrt{3} I $ respectively, are placed concentrically in XY and YZ planes respectively. Find the magnitude and direction of the net magnetic field at their common centre.

Assertion (A): EM waves do not require a medium for their propagation.
Reason (R): EM waves are transverse waves.

A long, straight wire carries a current of 10 A. The magnitude of the magnetic field at a distance of 5 cm from the wire is:

Wavelength of X-rays having the largest penetrating power is:

If an electromagnetic wave is totally reflected, the radiation pressure in terms of average Poynting vector S$_{av}$ is:

Figure shows a current carrying square loop ABCD of edge length is $ a $ lying in a plane. If the resistance of the ABC part is $ r $ and that of the ADC part is $ 2r $, then the magnitude of the resultant magnetic field at the center of the square loop is:

If $ \mu_0 $ and $ \epsilon_0 $ are the permeability and permittivity of free space, respectively, then the dimension of $ \left( \frac{1}{\mu_0 \epsilon_0} \right) $ is :

In an electromagnetic system, the quantity representing the ratio of electric flux and magnetic flux has dimension of $\mathrm{M}^{\mathrm{B}} \mathrm{L}^{\mathrm{O}} \mathrm{T}^{\mathrm{B}} \mathrm{A}^{\mathrm{S}}$, where value of 'Q' and 'R' are

An inductor of self inductance 1 H connected in series with a resistor of 100 $ \Omega $ and an AC supply of 10 V, 50 Hz. Maximum current flowing in the circuit is:

In an electromagnetic system, a quantity defined as the ratio of electric dipole moment and magnetic dipole moment has dimensions of [M$ L^2 T^{-3} A^{-1}]$. The value of P and Q are: