JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Application +4 | -1

The work done in turning a magnet of magnetic moment ‘

M

’ by an angle of

90^\circ

from the meridian is ‘

n

’ times the corresponding work done to turn it through an angle at

60^\circ

, when ‘

n

’ is given by

View answer and explanation

Correct option: B

Option D (3) is correct because the ratio of the magnetic fields can be found by comparing the time periods of oscillation with and without the additional magnet, using the formula for the time period of a bar magnet in a magnetic field.

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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