Bar Magnet – Page 2 – Rankers Physics
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Bar Magnet

Question 1:

Two bar magnets with magnetic moments 2M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis
through the centre. The crossed system sets in earth’s magnetic field with magnet having
magnetic moment 2M making and angle θ with the magnetic meridian such that :-

\[\theta=tan^{-1}\left( \frac{1}{\sqrt{3}} \right)\]
\[\theta=tan^{-1}\left( \sqrt{3} \right)\]
\[\theta=tan^{-1}\left( \frac{1}{{2}} \right)\]
\[\theta=tan^{-1}\left( \frac{3}{{4}} \right)\]
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No solution provided for this question.

Question 2:

Time period for a magnet is T. If it is divided in four equal parts along its axis and perpendicular
to its axis as shown then time period for each part will be :-

4 T
T/4
T/2
T
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No solution provided for this question.

Question 3:

A bar magnet is placed inside a non-uniform magnetic field. It may experience :-

force and torque
force but not torque
torque but not force
Neither force nor torque
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No solution provided for this question.

Question 4:

A square coil of side ‘a’ carrying current ‘ i ’ and is having one of its side AB parallel to
y-axis and its plane is at angle θ = 30° with x-axis. If a uniform magnetic field B exist in
the region along \[\hat{k}\] direction, then torque due to magnetic force on the coil is:

\[\frac{ia^{2}B}{2}\hat{j}\]
\[-\frac{ia^{2}B}{\sqrt{2}}\left(-\hat{k}+ \hat{j} \right)\]
\[-\frac{ia^{2}B}{2}\hat{j}\]
\[\frac{ia^{2}B}{2}\hat{i}\]
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No solution provided for this question.