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The effect of fringing increases as we _________

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The effect of fringing increases as we _________

(a) increase air gap

(b) decrease air gap

(c) increase in flux density

(d) introduce more ferric core material

I have been asked this question in an internship interview.

My question is taken from DC Motor Starting topic in section DC Motors of Electrical Machines

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The correct option is (a) increase air gap

For explanation: Fringing is the effect in which the magnetic flux lines bulge out of the flux. and it is introduced at the air gaps.

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