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JEE PHYSICS MCQ: MAGNETISM AND MATTER

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Application +4 | -1

A thin magnetic needle is placed in a magnetic field of

200 \mathrm{G}

with its axis at

30^{\circ}

to the direction of the field. find the magnetic moment of the needle if it experience a torque of

{0 . 0 1 2}

\mathrm{Nm}

in this field.

View answer and explanation

Correct option: A

1.2 \mathrm{Am}^2

Option A (

1.2 \mathrm{Am}^2

) is correct because it is calculated using the formula for torque on a magnetic dipole 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}}

\mu_{\mathrm{f}}

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