1

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

+4

-1

A paramagnetic sample shows a net magnetisation of 6 A/m when it is placed in an external
magnetic field of 0.4 T at a temperature of 4 K. When the sample is placed in an external magnetic
field of 0.3 T at a temperature of 24 K, then the magnetisation will be:

2

JEE Main 2020 (Online) 4th September Morning Slot

MCQ (Single Correct Answer)

+4

-1

A small bar magnet placed with its axis

at 30

experiences a torque of 0.018 Nm. The

minimum work required to rotate it from its

stable to unstable equilibrium position is :

at 30

^{o}with an external field of 0.06 Texperiences a torque of 0.018 Nm. The

minimum work required to rotate it from its

stable to unstable equilibrium position is :

3

JEE Main 2020 (Online) 3rd September Evening Slot

MCQ (Single Correct Answer)

+4

-1

A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a
paramagnetic substance. The whole system is placed in a uniform magnetic field $$\overrightarrow B $$
. Then the field
inside the paramagnetic substance is :

4

JEE Main 2020 (Online) 2nd September Morning Slot

MCQ (Single Correct Answer)

+4

-1

Magnetic materials used for making permanent
magnets (P) and magnets in a transformer (T)
have different properties of the following,
which property best matches for the type of
magnet required?

Questions Asked from Magnetic Properties of Matter (MCQ (Single Correct Answer))

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