JEE Main 2021 (Online) 16th March Morning Shift | Magnetic Properties of Matter Question 42 | Physics

A bar magnet of length 14 cm is placed in the magnetic meridian with its north pole pointing towards the geographic north pole. A neutral point is obtained at a distance of 18 cm from the center of the magnet. If B_H = 0.4 G, the magnetic moment of the magnet is : (1G = 10^$$-$$4 T)

2.880 $$\times$$ 10² J T^$$-$$1

2.880 J T^$$-$$1

2.880 $$\times$$ 10³ J T^$$-$$1

28.80 J T^$$-$$1

JEE Main 2021 (Online) 25th February Evening Shift

MCQ (Single Correct Answer)

-1

In a ferromagnetic material, below the curie temperature, a domain is defined as :

a macroscopic region with zero magnetization.

a macroscopic region with saturation magnetization.

a macroscopic region with randomly oriented magnetic dipoles.

a macroscopic region with consecutive magnetic dipoles oriented in opposite direction.

JEE Main 2021 (Online) 24th February Evening Shift

MCQ (Single Correct Answer)

-1

A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains :

may increase or decrease in size and change its orientation.

increase in size but no change in orientation.

decrease in size and changes orientation.

have no relation with external magnetic field.

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

-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:

4 A/m

1 A/m

0.75 A/m

2.25 A/m

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