Physics Electromagnetism DUHS 2023
PMDC Verified Question 17 of 58
Which of the following defines the change in magnetic flux per unit area?
A
Magnetic flux
B
Magnetic force
C
Magnetic dipole
D
Magnetic flux density
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Magnetic flux density
Concept:

The quantity of magnetic field lines packed into a specific area defines the strength of the field in that region.

Formula:

$$ B = \frac{\Phi}{A} $$

Solution:

  • The phrase "magnetic flux per unit area" is a direct verbal translation of the formula \( \Phi / A \).


  • By definition, flux divided by area yields the magnetic field \( \mathbf{B} \).


  • Another formal scientific term for \( \mathbf{B} \) is Magnetic flux density.


Why other options are incorrect:

Option A is the numerator itself. Option B relates to the physical push/pull on moving charges. Option C refers to a source of magnetic field (like a bar magnet), not the field distribution itself.

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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