Magnetism Physics Test Series IIT JEE

Test Preparation on Magnetism-Physics Test Series IIT JEE-2020

1.

The work done in turning a magnet of magnetic moment 'M'
by an angle of 90° from the meridian is 'n' times the
corresponding work done to turn it through an angle of 60°,
where 'n' is given by

11/2
22
31/4
41

2.

For protecting a sensitive equipment from the external
magnetic field, it should be
Surrounded with fine copper sheet

1 Placed inside an aluminium case
2Placed inside an iron case
3 Wrapped with insulation around it when passing current through it
4Surrounded with fine copper sheet

3.

A short bar magnet of magnetic moment 0.4 J T-1 is placed
in a uniform magnetic field of 0.16 T. The magnet is in
stable equilibrium when the potential energy is

1 -0.082 J
2 0.064 J
3-0.064 J
4 Zero

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