Physics-
General
Easy

Question

A circular ring of diameter 20 cm has a resistance of 0.01capital omega. The charge that will flow through the ring if it is turned from a position perpendicular to a uniform magnetic field of 2.0 T to a position to the field is about

  1. 63 C  
  2. 0.63 C  
  3. 6.3 C  
  4. 0.063 C  

The correct answer is: 6.3 C


    q equals fraction numerator d ϕ over denominator R end fraction equals blank fraction numerator B A left parenthesis c o s blank 0 degree minus cos invisible function application 90 degree right parenthesis over denominator R end fraction
    equals blank fraction numerator B pi r to the power of 2 end exponent open parentheses 1 minus 0 close parentheses over denominator R end fraction equals fraction numerator B pi r to the power of 2 end exponent over denominator R end fraction equals fraction numerator 2 cross times 3.143 cross times open parentheses 10 to the power of negative 1 end exponent close parentheses to the power of 2 end exponent over denominator 0.01 end fraction
    equals 6.286 blank C equals 6.3 blank C

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