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What is the relation between axial dimension and the area of the magnet?

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in Design of Electrical Machines by (687k points)
What is the relation between axial dimension and the area of the magnet?

(a) area of the magnet is directly proportional to the axial dimension

(b) area of the magnet is indirectly proportional to the axial dimension

(c) area of the magnet is directly proportional to the square of the axial dimension

(d) area of the magnet is indirectly proportional to the square of the axial dimension

The question was asked in an internship interview.

Question is taken from Design Steps and Considerations in portion Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

1 Answer

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Correct choice is (a) area of the magnet is directly proportional to the axial dimension

Easy explanation: The calculation of the axial dimension is one of the steps in the PMDC motors. The axial dimension is directly proportional to area of the magnet.

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