Physics-
General
Easy

Question

A solenoid 60 mm long has 50 turns on it and is wound on an iron rod of 7.5 mm radius. Find the flux through the solenoid when the current in it is 3A. The relative permeability of iron is 600

  1. 1.66 Wb  
  2. 1.66 nWb  
  3. 1.66 mWb  
  4. 1.66mu W b  

The correct answer is: 1.66 mWb


    ϕ equals mu subscript r end subscript mu subscript 0 end subscript fraction numerator N to the power of 2 end exponent over denominator l end fraction A i
    blank equals 600 cross times 4 pi cross times 10 to the power of negative 7 end exponent cross times 50 cross times 50 pi cross times fraction numerator open parentheses 7.5 cross times 10 to the power of negative 3 end exponent close parentheses to the power of 2 end exponent cross times 3 over denominator 6 cross times 10 to the power of negative 1 end exponent end fraction
    blank equals 1.66 cross times 10 to the power of negative 3 end exponent W b equals 1.66 m W b

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