Physics Electromagnetic Induction DUHS 2023
PMDC Verified Question 31 of 69
Induced e.m.f in A.C generator can be increased by:
A
Decreasing area of coil
B
Decreasing magnetic field
C
Increasing area of coil
D
Slowing down speed of coil
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Increasing area of coil
Concept:

The maximum Electromotive Force (EMF) generated by an AC generator depends directly on its physical dimensions and operating speed.

Formula:

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

Solution:

  • The equation reveals that maximum EMF is directly proportional to the Area (\( A \)) of the coil.


  • Therefore, increasing the area of the coil will linearly increase the total induced EMF.


Why other options are incorrect:

Decreasing the area, decreasing the magnetic field, or slowing the rotation (reducing \( \omega \)) all reduce the rate of flux change, which mathematically decreases the induced EMF.

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