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Which of the relationship is correct in Ferromagnetic motor?

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Which of the relationship is correct in Ferromagnetic motor?

(a) T ∝ (Ia)^2

(b) T ∝ (Ia)^0

(c) T ∝ Ia

(d) T^2 ∝ Ia

I had been asked this question in class test.

My question comes from Solar Powered Vehicles in division Solar and Battery Powered Drives of Electric Drives

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Correct choice is (c) T ∝ Ia

Easiest explanation: The value of flux remains constant in Ferromagnetic motor. The torque in the Ferromagnetic motor is directly proportional to the armature current.

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