1
JEE Main 2021 (Online) 25th February Evening Shift
+4
-1
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.
2
JEE Main 2021 (Online) 25th February Morning Shift
+4
-1
A proton, a deuteron and an $$\alpha$$ particle are moving with same momentum in a uniform magnetic field. The ratio of magnetic forces acting on them is _________ and their speed is _______, in the ratio.
A
2 : 1 : 1 and 4 : 2 : 1
B
4 : 2 : 1 and 2 : 1 : 1
C
1 : 2 : 4 and 2 : 1 : 1
D
1 : 2 : 4 and 1 : 1 : 2
3
JEE Main 2021 (Online) 25th February Morning Shift
+4
-1
Magnetic fields at two points on the axis of a circular coil at a distance of 0.05 m and 0.2 m from the centre are in the ratio 8 : 1. The radius of coil is ________.
A
1.0 m
B
0.15 m
C
0.2 m
D
0.1 m
4
JEE Main 2021 (Online) 24th February Evening Shift
+4
-1
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.
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Physics
Mechanics
Electricity
Optics
Modern Physics
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