X and Y plates of a CRO are connected to unequal voltages of equal frequency with phase of $90^\circ$. The Lissajous figure on the screen will be
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For a phase difference of \( 90^\circ \) or \( 270^\circ \):
- If amplitudes are equal $\rightarrow$ Circle.
- If amplitudes are unequal $\rightarrow$ Ellipse.
For a phase difference of \( 0^\circ \) or \( 180^\circ \) $\rightarrow$ Straight line.