CUET · PHYSICS · PYQ PAPER 2025
A charged particle enters a magnetic field with velocity v at an angle \( \theta \) with the field and experiences a magnetic force. The kinetic energy of the particle
- A becomes maximum if \( \theta = 90^\circ \)
- B becomes maximum if \( \theta = 0^\circ \)
- C becomes minimum if \( \theta = 180^\circ \)
- D is not affected by magnetic force
Answer & Solution
Correct Answer
(D) is not affected by magnetic force
Step-by-step Solution
Detailed explanation
The magnetic force \( \vec{F} = q(\vec{v} \times \vec{B}) \) is always perpendicular to the velocity \( \vec{v} \). Work done by magnetic force \( W = \vec{F} \cdot d\vec{s} = 0 \). Since \( W = \Delta KE \), the kinetic energy is not affected by magnetic force.
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