In a Weston synchronoscope the deflecting torque is zero when ___

In a Weston synchronoscope the deflecting torque is zero when

A. currents in fixed and moving coils are in phase
B. currents in fixed and moving coils are out of phase by 90°
C. currents in fixed and moving coils are out of phase by 60°
D. none of the above

Show Answer

Answer: B

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