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In three phase system, the line voltage VRY is equal to?

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In three phase system, the line voltage VRY is equal to?

(a) phasor sum of VRN and VNY

(b) phasor difference of VRN and VNY

(c) phasor sum of VRN and VNY

(d) algebraic sum of VRN and VNY

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This intriguing question originated from Voltage, Current and Power in a Star Connected System topic in division Polyphase Circuits of Network Theory

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The correct choice is (a) phasor sum of VRN and VNY

The explanation: In three phase system, the line voltage VRY is equal to the phasor sum of VRN and VNY which is also equal to the phasor difference of VRN and VYN.

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