Physics Alternating Current PMC 2022
PMDC Verified Question 80 of 127
A simple AC generator consists of how many magnetic poles?
A
0
B
1
C
2
D
3
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 2
Concept:

An elementary AC generator requires a magnetic dipole to provide a uniform magnetic field across the rotating armature coil.

Formula / Reaction:

$$\Phi = B A \cos(\omega t), \quad \varepsilon = -N \frac{d\Phi}{dt} = N B A \omega \sin(\omega t)$$

Solution:

  • A standard basic generator consists of at least one pair of magnetic poles: a North pole and a South pole (2 poles).


  • Magnetic field lines pass from the North to South pole across the armature.


Why other options are incorrect:

  • Opt_A: Magnetic fields cannot exist without poles.


  • Opt_B: Isolated magnetic monopoles do not exist in nature.


  • Opt_D: Magnetic poles always occur in conjugate pairs (even numbers: 2, 4, 6...).

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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