1
JEE Main 2022 (Online) 26th July Morning Shift
+4
-1 A charge particle is moving in a uniform magnetic field $$(2 \hat{i}+3 \hat{j}) \,\mathrm{T}$$. If it has an acceleration of $$(\alpha \hat{i}-4 \hat{j})\, \mathrm{m} / \mathrm{s}^{2}$$, then the value of $$\alpha$$ will be :

A
3
B
6
C
12
D
2
2
JEE Main 2022 (Online) 26th July Morning Shift
+4
-1 $$\mathrm{B}_{X}$$ and $$\mathrm{B}_{\mathrm{Y}}$$ are the magnetic fields at the centre of two coils $$\mathrm{X}$$ and $$\mathrm{Y}$$ respectively each carrying equal current. If coil $$X$$ has 200 turns and $$20 \mathrm{~cm}$$ radius and coil $$Y$$ has 400 turns and $$20 \mathrm{~cm}$$ radius, the ratio of $$B_{X}$$ and $$B_{Y}$$ is :

A
1 : 1
B
1 : 2
C
2 : 1
D
4 : 1
3
JEE Main 2022 (Online) 25th July Evening Shift
+4
-1 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
$$1.8 \times 10^{6} \mathrm{~Hz}$$
4
JEE Main 2022 (Online) 25th July Morning Shift
+4
-1 Two charged particles, having same kinetic energy, are allowed to pass through a uniform magnetic field perpendicular to the direction of motion. If the ratio of radii of their circular paths is $$6: 5$$ and their respective masses ratio is $$9: 4$$. Then, the ratio of their charges will be :

A
8 : 5
B
5 : 4
C
5 : 3
D
8 : 7
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
Mathematics
Algebra
Trigonometry
Coordinate Geometry
Calculus
EXAM MAP
Joint Entrance Examination