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The average power delivered to an impedance $(4-j3)\Omega$ by a current $5\cos(100\pi t+100)\text{A}$ is 

  1.  $44.2\;\text{W}$
  2.  $50\;\text{W}$
  3.  $62.5\;\text{W}$
  4.  $125\;\text{W}$
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