Physics-
General
Easy

Question

A coil of resistance 400 capital omega is placed in a magnetic filed. If the magnetic flux ϕ open parentheses w b close parentheseslinked with the coil varies with time t (se(c) as ϕ equals 50 t to the power of 2 end exponent plus 4. The current in the coil at t equals 2 sec is

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

The correct answer is: 0.5 blank A


    Induced e.m.f. epsilon equals fraction numerator d ϕ over denominator d t end fraction equals negative open parentheses 100 t close parentheses
    Induced current i at t equals 2 blank s e c
    equals open vertical bar fraction numerator epsilon over denominator R end fraction close vertical bar equals plus fraction numerator 100 cross times 2 over denominator 400 end fraction equals plus 0.5 blank A m p

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