1
JEE Main 2021 (Online) 16th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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 BH = 0.4 G, the magnetic moment of the magnet is : (1G = 10$$-$$4 T)
A
2.880 $$\times$$ 102 J T$$-$$1
B
2.880 J T$$-$$1
C
2.880 $$\times$$ 103 J T$$-$$1
D
28.80 J T$$-$$1
2
JEE Main 2021 (Online) 25th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In a ferromagnetic material, below the curie temperature, a domain is defined as :
A
a macroscopic region with zero magnetization.
B
a macroscopic region with saturation magnetization.
C
a macroscopic region with randomly oriented magnetic dipoles.
D
a macroscopic region with consecutive magnetic dipoles oriented in opposite direction.
3
JEE Main 2021 (Online) 24th February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
A soft ferromagnetic material is placed in an external magnetic field. The magnetic domains :
A
may increase or decrease in size and change its orientation.
B
increase in size but no change in orientation.
C
decrease in size and changes orientation.
D
have no relation with external magnetic field.
4
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:
A
4 A/m
B
1 A/m
C
0.75 A/m
D
2.25 A/m
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