Horizontal input to a scope is Em sin (ωt) V, vertical input to that scope is Em sin (ωt + 30°) V. What is the Lissajous pattern in that CRO?
Horizontal input to a scope is Em sin (ωt) V, vertical input to that scope is Em sin (ωt + 30°) V. What is the Lissajous pattern in that CRO? Correct Answer <img alt="F8 Jai Prakash 29-12-2020 Swati D11" src="//storage.googleapis.com/tb-img/production/21/01/F8_Jai%20Prakash_29-12-2020_Swati_D11.png" style="width: 101px; height: 102px;">
Concept:
When two sinusoidal signals of the same frequency and magnitude are applied two both pairs of deflecting plates of CRO, the Lissajous pattern changes with the change of phase difference between signals applied to the CRO
When 0 < ϕ < 90o or 270o < ϕ < 360o
The Lissajous pattern is of the shape of an Ellipse having a major axis passing through the origin from the first quadrant to the third quadrant.
When 90o < ø < 180o or 180o < ø < 270o
The Lissajous Pattern is of the shape of an Ellipse having a major axis passing through the origin from the second quadrant to the fourth quadrant.
Explanation:
The given inputs are: Em sin (ωt) V, Em sin (ωt + 30°) V
The phase difference between both the inputs = 30°
The Lissajous pattern on the screen of a CRO is an ellipse with a major axis in quadrant 1 and quadrant 3.
Important Points
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