Physics Electromagnetic Induction BUMHS 2024
PMDC Verified Question 15 of 69
Which of the following method can be used to vary induced emf in a coil?
A
Alternating magnetic field
B
Moving the coil in the magnetic field
C
Changing the shape of coil
D
All of the above
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: All of the above
Concept:

According to Faraday's law, an EMF is induced whenever the magnetic flux (\( \phi = B \cdot A \cdot \cos\theta \)) through a coil changes.

Solution:

  • Alternating magnetic field: Changes the \( B \) component of the flux over time.


  • Moving the coil: Can change the angle (\( \theta \)) or move the coil into a stronger/weaker field region.


  • Changing the shape of coil: Alters the effective Area (\( A \)) enclosed by the loop.


  • Since all three actions successfully change the magnetic flux over time, All of the above methods will vary the induced EMF.


Why other options are incorrect:

None of the individual options are wrong, making D the only comprehensive and correct choice.

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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