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Assuming an ideal transformer, the Thevenin’s equivalent voltage and impedance as seen from the terminals $x$ and $y$ for the circuit in figure are

  1. $2 \sin(wt) , 4 \Omega $
  2. $1 \sin(wt), 1\Omega$
  3. $1 \sin(wt), 2\Omega$
  4. $1 \sin(wt), 0.5\Omega$
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