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A two-phase load draws the following phase currens: $i_1(t)=I_m \sin(\omega t – \phi_1), i_2(t) = I_m \cos(\omega t – \phi_2)$. These currents are balanced if $\phi_1$ is equal to

  1. $- \phi_2$
  2. $\phi_2$
  3. $\pi/2 - \phi_2$
  4. $\pi/2 + \phi_2$
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