Physics-
General
Easy

Question

In the adjoining figure the impedance of the circuit will be

  1. 120 ohm    
  2. 50 ohm    
  3. 60 ohm    
  4. 90 ohm    

The correct answer is: 60 ohm


    i subscript L end subscript equals fraction numerator 90 over denominator 30 end fraction equals 3   A comma blank i subscript C end subscript equals fraction numerator 90 over denominator 20 end fraction equals 4.5   A
    Net current through circuit i equals i subscript C end subscript minus i subscript L end subscript   equals 1.5 A
    therefore Z equals fraction numerator V over denominator i end fraction equals fraction numerator 90 over denominator 1.5 end fraction equals 60 capital omega

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