JEE Main 2022 (Online) 27th July Morning Shift | Magnetic Properties of Matter Question 25 | Physics

Two bar magnets oscillate in a horizontal plane in earth's magnetic field with time periods of $$3 \mathrm{~s}$$ and $$4 \mathrm{~s}$$ respectively. If their moments of inertia are in the ratio of $$3: 2$$, then the ratio of their magnetic moments will be:

2 : 1

8 : 3

1 : 3

27 : 16

JEE Main 2022 (Online) 27th July Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

A magnet hung at $$45^{\circ}$$ with magnetic meridian makes an angle of $$60^{\circ}$$ with the horizontal. The actual value of the angle of dip is -

$$\tan ^{-1}\left(\sqrt{\frac{3}{2}}\right)$$

$$\tan ^{-1}(\sqrt{6})$$

$$\tan ^{-1}\left(\sqrt{\frac{2}{3}}\right)$$

$$ \tan ^{-1}\left(\sqrt{\frac{1}{2}}\right) $$

JEE Main 2022 (Online) 25th July Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

An electron with energy 0.1 keV moves at right angle to the earth's magnetic field of 1 $$\times$$ 10^$$-$$4 Wbm^$$-$$2. The frequency of revolution of the electron will be :

(Take mass of electron = 9.0 $$\times$$ 10^$$-$$31 kg)

$$1.6 \times 10^{5} \mathrm{~Hz}$$

$$5.6 \times 10^{5} \mathrm{~Hz}$$

$$2.8 \times 10^{6} \mathrm{~Hz}$$

$$1.8 \times 10^{6} \mathrm{~Hz}$$

JEE Main 2022 (Online) 29th June Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

At a certain place the angle of dip is 30$$^\circ$$ and the horizontal component of earth's magnetic field is 0.5 G. The earth's total magnetic field (in G), at that certain place, is :

$${1 \over {\sqrt 3 }}$$

$${1 \over 2}$$

$$\sqrt 3 $$

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