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Question:

A proton and an $\alpha$-particle (with their masses in the ratio of $1: 4$ and charges in the ratio $1: 2$ ) are accelerated from rest through a potential difference $V$. If a uniform magnetic field (B) is set up perpendicular to their velocities, the ratio of the radii $r_{p}: r_{\alpha}$ of the circular paths descrfibed by them will be:

1. $1: \sqrt{2}$

2. $1: 2$

3. $1: 3$

4. $1: \sqrt{3}$

Correct Option: 1

JEE Main Previous Year 1 Question of JEE Main from Physics Moving Charges and Magnetism chapter.
JEE Main Previous Year 12 Jan 2019, I

Solution:

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