Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is

Two sinusoidal signals of equal amplitude and frequency are applied to

1.	Two sinusoidal signals of equal amplitude and frequency are applied to X and Y plate of CRO respectively. The observed Lissajous pattern is a straight line. The phase shift between signals is
A.	zero
B.	90°
C.	either zero or 180°
D.	either 90° or 270°
Answer» D. either 90° or 270°