Physics Electromagnetic Induction BUMHS 2022
PMDC Verified Question 49 of 69
The maximum value of induced emf in a rotating coil in a magnetic field does not depend upon:
A
Resistance of the coil
B
Number of turns in the coil
C
Area of the coil
D
Frequency of rotation of the coil
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Resistance of the coil
Concept:

The peak Electromotive Force (EMF) of an AC generator is determined by its physical construction and rotational speed.

Formula:

$$ \varepsilon_{\text{max}} = N \omega A B $$

Solution:

  • The equation shows dependence on Number of turns (\( N \)), Angular frequency (\( \omega = 2\pi f \)), Area (\( A \)), and Magnetic Field (\( B \)).


  • The Resistance of the coil determines the current that will flow once a load is connected, but it has absolutely no effect on the raw open-circuit voltage (EMF) being generated.


Why other options are incorrect:

Options B, C, and D are direct variables (\( N, A, f \)) in the generator formula, so the EMF heavily depends on them.

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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