Physics Electromagnetism DUHS 2022
PMDC Verified Question 35 of 58
The path of a neutron moving perpendicular to magnetic field is:
A
Curve
B
Straight line
C
Circle
D
Ellipse
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Straight line
Concept:

A magnetic field exerts a deflecting force to curve the path of a particle ONLY if that particle carries an electric charge.

Formula:

$$ F = qvB \sin(\theta) $$

Solution:

  • A neutron is an uncharged particle (\( q = 0 \)).


  • Therefore, regardless of its angle of entry (even perpendicular, \( \sin(90^\circ) = 1 \)), the force evaluates to \( F = 0 \).


  • According to Newton's First Law, an object in motion stays in motion in a straight line unless acted upon by a net external force.


Why other options are incorrect:

Options A, C, and D describe trajectories that require a continuous perpendicular force (centripetal force) acting on the object, which is impossible for a neutral particle in a magnetic field.

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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