How will the length of the air gap in a DC electric machine affect pulsational loss in pole faces?

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answerhappygod
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How will the length of the air gap in a DC electric machine affect pulsational loss in pole faces?

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a) Pulsational loss increases with an increase in air gap length
b) Pulsational loss decreases with an increase in air gap length
c) Pulsational loss does not change with an increase in air gap length
d) Pulsational loss may increase or decrease with an increase in air gap length
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