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The output voltage of the ideal transformer with the polarities and dots shown in the figure is given by

  1. $NV_i\sin \omega t$
  2. $-NV_i\sin \omega t$
  3. $\frac{1}{N}V_i\sin \omega t$
  4. $-\frac{1}{N}V_i\sin \omega t$
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