A phase difference of 90 degrees is equal to:
Correct answer: B. pi/2 radians
- A. pi radians
- B. pi/2 radians
- C. 2 pi radians
- D. pi/4 radians
Explanation
A complete cycle is 360 degrees or 2 pi radians, so 90 degrees is a quarter of a cycle, that is pi over 2 radians. This is the phase difference between current and voltage in a purely capacitive or purely inductive AC circuit, which is why no net power is dissipated in either. The Greek letter did not print cleanly in the original paper.
This question appeared on the UHS MDCAT 2025 paper, which you can sit online with every answer explained.
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About Phase of Alternating Current
Phase describes the position of an alternating voltage or current within its cycle and the phase difference between two sinusoidal quantities. The topic covers in phase signals, phase angle and lead or lag in resistive, inductive and capacitive circuits, rather than the amplitude or frequency of the supply.
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