A magnet of magnetic moment $M$ is rotated through $360^\circ$ in a magnetic field $H$. The work done will be

A bar magnet of magnetic moment ${10^4}J/T$ is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of $4 imes {10^{ - 5}}T$ to a direction $60^\circ$ from the field will be

A bar magnet is placed in the position of stable equilibrium in a uniform magnetic field of induction $B.$ If it is rotated through an angle $180^\circ ,$ then the work done is ($M =$ Magnetic dipole moment of bar magnet)

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. The energy required to rotate it by ${60^{\rm{o}}}$ is W. Now the torque required to keep the magnet in this new position is :

A bar magnet is held perpendicular to a uniform magnetic field. The torque acting on the magnet is doubled when the strength of the magnetic field is:

A bar magnet is placed in a non-uniform magnetic field. Which of the following is true?

A rigid circular loop of radius $r$ and mass $m$ lies in the $x - y$ plane of a flat table and has a current $i$ flowing in it. At this particular place the earth’s magnetic field is $B = {B_x}\hat i + {B_z}\widehat {k.}$ ̂ The value of $i$ so that the loop start tilting is

A magnet of magnetic moment $M$ is rotated through $360^\circ$ in a magnetic field $H$. The work done will be

A bar magnet experiences a torque when placed in a uniform magnetic field. This torque is maximum when the angle between the magnetic moment of the magnet and the magnetic field is:

A bar magnet is suspended by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium. The energy required to rotate it by $60^\circ$ is $W$. The torque required to hold the magnet at this new position is:

Two identical short bar magnets, each of magnetic moment $M$, are placed perpendicular to each other at a separation $d$. The magnitude of the magnetic field at a point midway between them is: