Magnetics 1 Question 29
29. An electron and a proton are moving with the same kinetic energy along the same direction. When they pass through a uniform magnetic field perpendicular to the direction of their motion, they describe circular path of the same radius.
(1985, 3M)
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Answer:
Correct Answer: 29. (c)
Solution:
- $r=\frac{\sqrt{2 k m}}{B q}$ or $r \propto \sqrt{m}$
( $k, q$ and $B$ are same)
$$ m _p>m _e \Rightarrow \quad \therefore \quad r _p>r _e $$
