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What happens to the MMF when the magnetic flux decreases?

This question was previously asked in
BPSC AE Paper 4 (General Engineering Science) 2019 Official Paper
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  1. Increases
  2. Decreases
  3. Remains constant
  4. Becomes zero

Answer (Detailed Solution Below)

Option 2 : Decreases
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Detailed Solution

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MMF:

We know that, Ohm’s law for magnetic circuit states that the MMF is directly proportional to the magnetic flux where reluctance is the constant of proportionality.

MMF = flux × reluctance

flux ∝ MMF  

↓ MMF → ↓ flux

So, MMF decreases with decrease in magnetic flux.
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