Magnetism PYQs - Last 5 Years

There is a ring of radius $r$ having linear charge density $\lambda$ and rotating with a uniform angular velocity $\omega$. The magnitude of the magnetic field produced by this ring at its own centre would be ( $\mu_0=$ permeability of air)...

The magnetic moment of an iron bar is $M$. It is now bent in such a way that it forms an arc section of a circle subtending an angle of $60^{\circ}$ at the centre. The magnetic moment of the arc section is

A circular coil, carrying current, has radius $R$. The distance from the centre of the coil on the axis where the magnetic induction will be $\frac{1}{27}$ th of its value at the centre of the coil is

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

A charged particle moving with a velocity \(\vec{v}=v_1 \hat{i}+v_2 \hat{j}\) in a magnetic field \(\vec{B}\) experiences a force \(\vec{F}=F_1 \hat{i}+F_2 \hat{j}\). Here \(v_1, v_2, F_1, F_2\) all are constants. Then $$\overrightarrow{\ma...

A bar magnet falls from rest under gravity through the centre of a horizontal ring of conducting wire as shown in figure. Which of the following graph best represents the speed (v) vs. time (t) graph of the bar magnet?

A wire carrying a steady current I is kept in the x-y plane along the curve \(y=A \sin \left(\frac{2 \pi}{\lambda} x\right)\). A magnetic field B exists in the z-direction. The magnitude of the magnetic force in the portion of the wire bet...

As shown in figure, a rectangular loop of length 'a' and width 'b' and made of a conducting material of uniform cross-section is kept in a horizontal plane where a uniform magnetic field of intensity B is acting vertically downward. Resist...

A horizontal semi-circular wire of radius r is connected to a battery through two similar springs X and Y to an electric cell, which sends current I through it. A vertically downward uniform magnetic field B is applied on the wire, as shown...

A straight wire is placed in a magnetic field that varies with distance x from origin as \(\overrightarrow B = {B_0}\left( {2 - {x \over a}} \right)\widehat k\). Ends of wire are at (a, 0) and (2a, 0) and it carries a current I. If force o...

An electron revolves around the nucleus in a circular path with angular momentum \(\overrightarrow L\). A uniform magnetic field \(\overrightarrow B\) is applied perpendicular to the plane of its orbit. If the electron experiences a torqu...

Two infinite line-charges parallel to each other are moving with a constant velocity v in the same direction as shown in the figure. The separation between two line-charges is d. The magnetic attraction balances the electric repulsion when...