CUET · PHYSICS · PYQ PAPER 2025
A proton and an alpha particle of the same velocity enter in turn a region of uniform magnetic field, acting perpendicular to their direction of motion. The ratio of the radii of the circular paths described by the particles, respectively, would be
- A \(1:2\)
- B \(1:3\)
- C \(2:1\)
- D \(3:1\)
Answer & Solution
Correct Answer
(A) \(1:2\)
Step-by-step Solution
Detailed explanation
\( r = \frac{mv}{qB} \) \( \frac{r_p}{r_\alpha} = \frac{(m_p/q_p)}{(m_\alpha/q_\alpha)} = \frac{(m/e)}{(4m/2e)} \) \( \frac{r_p}{r_\alpha} = \frac{1}{2} \)
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