Electrical and Electronics Measurements Measurement of Power

In the two-wattmeter method, if w1 = v1 I1 cos(30° - ϕ), w2 = v1 I1 cos(30° + ϕ)  then reactive power Q?

1
1.732 (w1 - w2)
2
0.707 (w1 - w2)
3
1.732 (w1 + w2)
4
1.414 (w1 - w2)

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