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In an unbalanced three phase system, phase current $I_a=1\angle (-90^0) pu$ , negative sequence current $I_{b2}=4\angle (-150^0) pu$, zero sequence current $I_{c0}=3\angle (90^0) pu$. The magnitude of phase current $I_b$ in $pu$ is

  1. $1.00$
  2. $7.81$
  3. $11.53$
  4. $13.00$
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