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Question

A series AC circuit has a resistance of 4Ω and a reactance of 3Ω. The impedance of the circuit is
  1. 5Ω
  2. 7Ω
  3. 12/7Ω
  4. 7/12Ω

A
7/12Ω
B
5Ω
C
7Ω
D
12/7Ω
Solution
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Impedance(Z)=R2+X2

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