1
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
The magnetic susceptibility of a material of a rod is 499. Permeability in vacuum is 4$$\pi$$ $$\times$$ 10$$-$$7 H/m. Absolute permeability of the material of the rod is :
A
4$$\pi$$ $$\times$$ 10$$-$$4 H/m
B
2$$\pi$$ $$\times$$ 10$$-$$4 H/m
C
3$$\pi$$ $$\times$$ 10$$-$$4 H/m
D
$$\pi$$ $$\times$$ 10$$-$$4 H/m
2
JEE Main 2021 (Online) 18th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which of the following statements are correct?

(A) Electric monopoles do not exist whereas magnetic monopoles exist.

(B) Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined.

(C) Magnetic field lines are completely confined within a toroid.

(D) Magnetic field lines inside a bar magnet are not parallel.

(E) $$\chi $$ = $$-$$1 is the condition for a perfect diamagnetic material, where x is its magnetic susceptibility.

Choose the correct answer from the options given below :
A
(A) and (B) only
B
(B) and (C) only
C
(C) and (E) only
D
(B) and (D) only
3
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
4
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.
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