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In a Weston synchronoscope the deflecting torque is zero when | |
A. | currents in fixed and moving coils are in phase [Wrong Answer] |
B. | currents in fixed and moving coils are out of phase by 90° [Correct Answer] |
C. | currents in fixed and moving coils are out of phase by 60° [Wrong Answer] |
D. | none of the above [Wrong Answer] |