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The electromagnetic torque developed in any physical system, and with magnetic saturation neglected, acts in such a direction as to tend to ____________

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The electromagnetic torque developed in any physical system, and with magnetic saturation neglected, acts in  such a direction as to tend to ____________

(a) decrease both the reluctance and inductance

(b) increase both the reluctance and inductance

(c) decrease the reluctance and increase the inductance

(d) increase the reluctance and decrease the inductance

This question was addressed to me in a job interview.

This key question is from Singly Excited Magnetic Systems topic in section Magnetic Circuits of Electrical Machines

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Right choice is (c) decrease the reluctance and increase the inductance

Explanation: fe=1/2 ∅^2  dRl/dx, Te=-1/2 ∅^2  dRl/dθ = 1/2 i^2  dL/dθ.

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