JEE Main 2021 (Online) 22th July Evening Shift | Magnetic Properties of Matter Question 30 | Physics

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

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Statement I : The ferromagnetic property depends on temperature. At high temperature, ferromagnet becomes paramagnet.

Statement II : At high temperature, the domain wall area of a ferromagnetic substance increases.

In the light of the above statements, choose the most appropriate answer from the options given below :

Statement I is false but Statement II is true

Statement I is true but Statement II is false

Both Statement I and Statement II are false

Both Statement I and Statement II are true

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

At an angle of 30$$^\circ$$ to the magnetic meridian, the apparent dip is 45$$^\circ$$. Find the true dip :

$${\tan ^{ - 1}}\sqrt 3 $$

$${\tan ^{ - 1}}{1 \over {\sqrt 3 }}$$

$${\tan ^{ - 1}}{2 \over {\sqrt 3 }}$$

$${\tan ^{ - 1}}{{\sqrt 3 } \over 2}$$

JEE Main 2021 (Online) 20th July Evening Shift

MCQ (Single Correct Answer)

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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 :

4$$\pi$$ $$\times$$ 10^$$-$$4 H/m

2$$\pi$$ $$\times$$ 10^$$-$$4 H/m

3$$\pi$$ $$\times$$ 10^$$-$$4 H/m

$$\pi$$ $$\times$$ 10^$$-$$4 H/m

JEE Main 2021 (Online) 18th March Evening Shift

MCQ (Single Correct Answer)

-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) and (B) only

(B) and (C) only

(B) and (D) only

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