Question

A proton, a deuteron (nucleus of $1_H^2)$ and an $\alpha$-particle with same kinetic energy enter a region of uniform
magnetic field moving at right angles to the field. The ratio of the radii of their circular path is

• A. 1 : 2 : 4
• B. $1:\sqrt{2}:1$
• C. $2:\sqrt{2}:1$
• D. 1 : 1 : 2

Answer 1

The correct option is B

$1:\sqrt{2}:1$

R= mv / bq