A magnet of magnetic moment $2 J T^{- 1}$ is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring the magnet normal to the magnetic field

0.1 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

0.2 J

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

1 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

2 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B 0.2 J
$W = M B (1 - c o s θ) = 2 \times 0.1 \times (1 - c o s 90^{\circ}) = 0.2 J$

Suggest Corrections

Similar questions

A bar magnet of magnetic moment 1.5 J T⁻¹ lies aligned with the direction of a uniform magnetic field of 0.22 T.

(a) What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: (i) normal to the field direction, (ii) opposite to the field direction?

(b) What is the torque on the magnet in cases (i) and (ii)?

Q. A bar magnet of magnetic moment 6 J/T is aligned at

60^{0}

with a uniform external magnetic field of 0.44 T. Calculate (a) the work done in turning the magnet to align its magnetic moment (i) normal to the magnetic field, (ii) opposite to the magnetic field, and
(b) the torque on the magnet in the final orientation
in case (ii).

Join BYJU'S Learning Program

A magnet of magnetic moment 2JT−1 is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring the magnet normal to the magnetic field

The correct option is B 0.2 JW=MB(1−cos θ)=2×0.1×(1−cos 90∘)=0.2 J

A magnet of magnetic moment $2 J T^{- 1}$ is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring the magnet normal to the magnetic field

The correct option is B 0.2 J
$W = M B (1 - c o s θ) = 2 \times 0.1 \times (1 - c o s 90^{\circ}) = 0.2 J$