Physics-
General
Easy

Question

In 0.1 s, the current in a coil increases from 1A to 1.5 A. If inductance of coil is 60mH, then induced current in external resistance of 3 capital omega will be

  1. 1 A  
  2. 0.5 A  
  3. 0.2 A  
  4. 0.1 A  

The correct answer is: 0.1 A


    Induced emf,open vertical bar e close vertical bar equals L fraction numerator d i over denominator d t end fraction
    equals open parentheses 60 cross times 10 to the power of negative 3 end exponent close parentheses cross times fraction numerator left parenthesis 1.5 minus 1 right parenthesis over denominator 0.1 end fraction
    equals blank fraction numerator 60 cross times 10 to the power of negative 3 end exponent cross times 0.5 over denominator 0.1 end fraction
    = 0.3 V
    Induced current,
    i equals fraction numerator e over denominator R end fraction equals fraction numerator 0.3 over denominator 3 end fraction equals 0.1 blank A

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