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What is the relation of the brush shift with the demagnetization effect?

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What is the relation of the brush shift with the demagnetization effect?

(a) brush shift is directly proportional to the demagnetization effect

(b) brush shift is indirectly proportional to the demagnetization effect

(c) brush shift is directly proportional to the square of the demagnetization effect

(d) brush shift is indirectly proportional to the square of the demagnetization effect

I had been asked this question in a national level competition.

The above asked question is from Design Steps and Considerations topic in chapter Design of Permanent Magnet (PM) DC Motors of Design of Electrical Machines

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The correct choice is (a) brush shift is directly proportional to the demagnetization effect

Explanation: The second design consideration is the brushes in the PMDC motor. The brush shift increases the demagnetizing effect.

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