Physics-
General
Easy

Question

The magnetic field in the cylindrical region shown in figure increases at a constant rate of 20 mT/sec. Each side of the square loop ABCD has a length of 1 cm and resistance of 4W. Find the current in the wire AB if the switch S is closed

  1. 1.25 cross times 1 0 to the power of negative 7 end exponent A, (anti-clockwise)    
  2. 1.25 cross times 1 0 to the power of negative 7 end exponent A (clockwise)    
  3. 2.5 cross times 1 0 to the power of negative 7 end exponent A (anti clockwise)    
  4. 2.5 cross times 1 0 to the power of negative 7 end exponent A (clockwise)    

The correct answer is: 1.25 cross times 1 0 to the power of negative 7 end exponent A, (anti-clockwise)


    i equals fraction numerator e over denominator R end fraction equals fraction numerator A over denominator R end fraction. fraction numerator d B over denominator d t end fraction equals fraction numerator left parenthesis 1 cross times 1 0 to the power of negative 2 end exponent right parenthesis to the power of 2 end exponent over denominator 16 end fraction cross times 20 cross times 1 0 to the power of negative 3 end exponent equals 1.25 cross times 1 0 to the power of negative 7 end exponent A
    (Anti-clockwise)

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