1
JEE Main 2022 (Online) 25th July Evening Shift
+4
-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)

A
$$1.6 \times 10^{5} \mathrm{~Hz}$$
B
$$5.6 \times 10^{5} \mathrm{~Hz}$$
C
$$2.8 \times 10^{6} \mathrm{~Hz}$$
D
$$1.8 \times 10^{6} \mathrm{~Hz}$$
2
JEE Main 2022 (Online) 29th June Morning Shift
+4
-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 :

A
$${1 \over {\sqrt 3 }}$$
B
$${1 \over 2}$$
C
$$\sqrt 3$$
D
1
3
JEE Main 2022 (Online) 28th June Evening Shift
+4
-1

The space inside a straight current carrying solenoid is filled with a magnetic material having magnetic susceptibility equal to 1.2 $$\times$$ 10$$-$$5. What is fractional increase in the magnetic field inside solenoid with respect to air as medium inside the solenoid?

A
1.2 $$\times$$ 10$$-$$5
B
1.2 $$\times$$ 10$$-$$3
C
1.8 $$\times$$ 10$$-$$3
D
2.4 $$\times$$ 10$$-$$5
4
JEE Main 2022 (Online) 27th June Morning Shift
+4
-1

The susceptibility of a paramagnetic material is 99. The permeability of the material in Wb/A-m, is :

[Permeability of free space $$\mu$$0 = 4$$\pi$$ $$\times$$ 10$$-$$7 Wb/A-m]

A
4$$\pi$$ $$\times$$ 10$$-$$7
B
4$$\pi$$ $$\times$$ 10$$-$$4
C
4$$\pi$$ $$\times$$ 10$$-$$5
D
4$$\pi$$ $$\times$$ 10$$-$$6
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