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Network TheoryAC Circuit Analysis

A series circuit has R = 3 ohm and inductive reactance XL = 4 ohm. The magnitude of its impedance is?

  • A1 ohm
  • B5 ohm
  • C7 ohm
  • D12 ohm
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Correct Answer: B. 5 ohm
Explanation: For Z = R+jXL, |Z| = sqrt(R^2+XL^2) = sqrt(9+16) = 5 ohm.
Reference: Standard network theory: ac circuit analysis
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