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In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be_______________?

/ Measurement and Instrumentation / By
In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be_______________?

A. unity
B. 0.5
C. 0.3
D. zero