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An ammeter, a voltmeter, and a wattmeter were installed in an ac circuit and read 15 Aᵣₘₛ 115 Vᵣₘₛ. and 1,500 W, respectively. The power factor of the circuit is most nearly:

A -0.87
B -0.5
C. 0.5
D. 0.87

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