Physics-
General
Easy

Question

The distance between the circular plates of a parallel plate condenser 40 m m in diameter, in order to have same capacity as a sphere of radius 1   m e t r eis

  1. 0.01 m m    
  2. 0.1 m m    
  3. 1.0 m m    
  4. 10 m m    

The correct answer is: 0.1 m m


    4 pi epsilon subscript 0 end subscript r equals fraction numerator epsilon subscript 0 end subscript A over denominator d end fraction Þ d equals fraction numerator A over denominator 4 pi r end fraction equals fraction numerator pi left parenthesis 20 cross times 1 0 to the power of negative 3 end exponent right parenthesis to the power of 2 end exponent over denominator 4 pi cross times 1 end fraction equals 0.1 m m

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