Discussion
Match the display with what it indicates about two equal-frequency signals.
1. Straight sloping line 2. Circle 3. Ellipse with axes not vertical
P. Ninety degrees apart with equal amplitudes Q. Some intermediate phase difference R. In phase
Answer: D
The line, the ellipse and the circle are the three cases of one family: zero phase collapses the ellipse into a line, quadrature with equal amplitudes opens it into a circle, and anything between gives a tilted ellipse.
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