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A Lissajous figure that is a circle indicates a phase difference of

  • A.zero
  • B.one hundred and eighty degrees
  • C.forty-five degrees
  • D.ninety degrees with equal amplitudes

Answer: D

The parametric equations of a circle are a sine and a cosine of equal amplitude, which is exactly two signals of the same frequency and amplitude in quadrature. The sense in which the spot travels round distinguishes a lead from a lag.

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