Physics Electromagnetism ETEA 2022
PMDC Verified Question 31 of 58
When a neutron enters into a magnetic field B perpendicularly with velocity v, its acceleration is:
A
Zero
B
Centripetal
C
Positive
D
Uniform and non-zero
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Zero
Concept:

A magnetic field only exerts force on moving particles that have a net electric charge.

Formula:

$$ F = qvB \sin(\theta) \quad \text{and} \quad a = \frac{F}{m} $$

Solution:

  • A neutron, by definition, is a neutral particle. Therefore, its charge \( q = 0 \).


  • Substitute this into the force formula: \( F = (0)vB \sin(90^\circ) = 0 \ \text{N} \).


  • According to Newton's Second Law, acceleration is force divided by mass. Since force is zero, \( a = \frac{0}{m} = 0 \).


  • The particle continues completely undeflected without any acceleration.


Why other options are incorrect:

Options B, C, and D assume the particle is charged (like a proton or electron) and would therefore experience a deflecting centripetal acceleration.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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