Discussion
The driving torque of an induction energy meter is proportional to the product of the two fluxes and
Answer: D
The interaction of two alternating fluxes with the eddy currents each induces gives a mean torque proportional to \( \Phi_1 \Phi_2 \sin\alpha \). Making the angle between them the complement of the load phase angle turns the sine into the cosine of that angle and the torque into power.
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