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Question

A solenoid is 1.5 blank m long and its inner diameter is 4.0 blank c m. It has three layers of windings of 1000 turns each and carries a current of 2.0 blank a m p e r e s. The magnetic flux for a cross-section of the solenoid is nearly

  1. 2.5 cross times 10 to the power of negative 7 end exponent blank w e b e r  
  2. 6.31 cross times 10 to the power of negative 6 end exponent blank w e b e r  
  3. 5.2 cross times 10 to the power of negative 5 end exponent blank w e b e r  
  4. 4.1 cross times 10 to the power of negative 5 end exponent blank w e b e r  

The correct answer is: 6.31 cross times 10 to the power of negative 6 end exponent blank w e b e r


    ϕ equals mu subscript 0 end subscript n i A equals 4 pi cross times 10 to the power of negative 7 end exponent cross times fraction numerator 3000 over denominator 1.5 end fraction cross times 2 cross times pi open parentheses 2 cross times 10 to the power of negative 2 end exponent close parentheses to the power of 2 end exponent
    equals 6.31 cross times 10 to the power of negative 6 end exponent W b

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