JEE PHYSICS MCQ: MAGNETISM AND MATTER

1 Medium

1 of 1

Application +4 | -1

A short bar magnet placed with its axis at

30^{\circ}

experiences a torque of

0.016\,\mathrm{Nm}

in an external field of

800 \mathrm{G}

. (a) What is the magnetic moment of the magnet? (b) What is the work done by an external force in moving it from its most stable to most unstable position?

View answer and explanation

Correct option: A

0.40\,\mathrm{Am}^2;\,0.064 \mathrm{~J}

Option A (

0.40\,\mathrm{Am}^2;\,0.064 \mathrm{~J}

) is correct because it correctly calculates the magnetic moment and work done.

More Questions from MAGNETISM AND MATTER

Practice All Chapter MCQs →

Curie temperature is the one above which A vibration magnetometer consists of two identical bar magnets placed one over the other such that they are perpendicular and bisect each other. The time period of oscillation in a horizontal magnetic field is

{2^{5/4}}

s. One of the magnets is removed and if the other magnet oscillates in the same field , then the time period in second is The relative permeability of a substance

X

is slightly less than unity and that of substance

Y

is slightly more than unity, then A bar magnet is equivalent to If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by

\mu_{\mathrm{d}}, \mu_{\mathrm{p}}

and

\mu_{\mathrm{f}}

respectively, then :- Which of the following is most suitable for the core of electromagnets