JEE Main 2022 · 26 Jun · Shift 1 · Physics Q44

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PhysicsSingle correct+4 / -1Question 44 of 90

A proton and an alpha particle of the same velocity enter in a uniform magnetic field which is acting perpendicular to their direction of motion. The ratio of the radii of the circular paths described by the alpha particle and proton is :

1 : 4

4 : 1

2 : 1

1 : 2

Answer and worked solution

Official answer: C

Radius $r=\dfrac{mv}{qB}\propto\dfrac mq$ at the same speed.

Ratio. $\dfrac{4/2}{1/1}=2$ , so $2:1$ .

(C)

Topics:Motion in magnetic and electric fields

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JEE Main 2022 · 26 Jun · Shift 1, Physics question 44