1
JEE Main 2024 (Online) 29th January Evening Shift
+4
-1

Two particles $$X$$ and $$Y$$ having equal charges are being accelerated through the same potential difference. Thereafter they enter normally in a region of uniform magnetic field and describes circular paths of radii $$R_1$$ and $$R_2$$ respectively. The mass ratio of $$X$$ and $$Y$$ is :

A
$$\left(\frac{R_1}{R_2}\right)$$
B
$$\left(\frac{R_2}{R_1}\right)$$
C
$$\left(\frac{R_2}{R_1}\right)^2$$
D
$$\left(\frac{R_1}{R_2}\right)^2$$
2
JEE Main 2024 (Online) 27th January Morning Shift
+4
-1

A proton moving with a constant velocity passes through a region of space without any change in its velocity. If $$\overrightarrow{\mathrm{E}}$$ and $$\overrightarrow{\mathrm{B}}$$ represent the electric and magnetic fields respectively, then the region of space may have :

(A) $$\mathrm{E}=0, \mathrm{~B}=0$$

(B) $$\mathrm{E}=0, \mathrm{~B} \neq 0$$

(C) $$\mathrm{E} \neq 0, \mathrm{~B}=0$$

(D) $$\mathrm{E} \neq 0, \mathrm{~B} \neq 0$$

Choose the most appropriate answer from the options given below :

A
(A), (B) and (C) only
B
(A), (C) and (D) only
C
(A), (B) and (D) only
D
(B), (C) and (D) only
3
JEE Main 2023 (Online) 13th April Evening Shift
+4
-1

An electron is moving along the positive $$\mathrm{x}$$-axis. If the uniform magnetic field is applied parallel to the negative z-axis, then

A. The electron will experience magnetic force along positive y-axis

B. The electron will experience magnetic force along negative y-axis

C. The electron will not experience any force in magnetic field

D. The electron will continue to move along the positive $$\mathrm{x}$$-axis

E. The electron will move along circular path in magnetic field

Choose the correct answer from the options given below:

A
A and E only
B
B and D only
C
B and E only
D
C and D only
4
JEE Main 2023 (Online) 13th April Morning Shift
+4
-1

The source of time varying magnetic field may be

(A) a permanent magnet

(B) an electric field changing linearly with time

(C) direct current

(D) a decelerating charge particle

(E) an antenna fed with a digital signal

Choose the correct answer from the options given below:

A
(D) only
B
(A) only
C
(B) and (D) only
D
(C) and (E) only
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