Question

Lissajous pattern was obtained for voltages of same frequency and different phase are connected to Y and X plates of CRO as shown below. If the spot that generates pattern moves in clockwise direction in pattern, the phase difference between signal X and Y

• A. ${30}^o$
• B. ${45}^o$
• C. ${135}^o$
• D. ${60}^o$

Answer 1

The correct option is A ${30}^o$


As spot generating the pattern moves in clockwise direction

$So,sin\varphi =\frac{y_1}{y_2}$
$\text{(Where}\varphi =\text{Phase difference)}$

$sin\varphi =\frac{2.5}{5}=0.5$

$\varphi ={30}^o$