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What is the formula for the width of pole of DC machines?

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What is the formula for the width of pole of DC machines?

(a) width of pole body = area of the pole * length of the pole

(b) width of pole body = area of the pole + length of the pole

(c) width of pole body = area of the pole – length of the pole

(d) width of pole body = area of the pole / length of the pole

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This question is from Pole Design in chapter Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

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Right answer is (d) width of pole body = area of the pole / length of the pole

Explanation: For obtaining the width of the pole, the area of the pole is first obtained. Then the length of the pole is calculated. The ratio of area of the pole to the length of the pole gives the width.

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