Question: The three-phase source line-to-neutral voltages are given by (E_{a n}=10 angle 0^{circ}), (E_{b n}=10 angle+240^{circ}), and (E_{c n}=10 angle-240^{circ}) volts. Is the source balanced? (a)

The three-phase source line-to-neutral voltages are given by $E_{a n}=10 \angle 0^{\circ}$, $E_{b n}=10 \angle+240^{\circ}$, and $E_{c n}=10 \angle-240^{\circ}$ volts.

Is the source balanced?

(a) Yes

(b) No

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