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It appears correct. In this case, the closing side is AB.Here, it is given terminal voltage is the closing side of the whole polygon. My question is how did this happen?
I can not understand the underlined lines.
I know, I know. Young students do struggle with some of these concepts (and when they are getting some idea about vectors, they encounter complex numbers. We also had a deep suspicion that our teachers too were not very clear about what they were talking. Enlightenment was never easy!I think, the problem behind the question is lack of understanding about AC machines and why the phasors or mapped to a half-circle.