Physics-
General
Easy

Question

Time constant of L-R circuit will be

  1. fraction numerator L over denominator R end fraction    
  2. fraction numerator 2 L over denominator R end fraction    
  3. fraction numerator L over denominator 2 R end fraction    
  4. None of above    

The correct answer is: fraction numerator L over denominator 2 R end fraction


    Above equivalent circuit can be drawn as follow
    Where R subscript e q end subscript equals R plus fraction numerator 2 R cross times 2 R over denominator 4 R end fraction equals R plus R
    R subscript e q end subscript equals 2 R semicolon therefore Time constant equals fraction numerator L over denominator 2 R end fraction

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