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A sphere of radius r is charged to a potential V. The outward pull per unit area of its surface is given by

  1. fraction numerator 4 pi epsilon subscript 0 V squared over denominator r squared end fraction
  2. fraction numerator epsilon subscript 0 V squared over denominator 2 r squared end fraction
  3. fraction numerator 2 epsilon subscript 0 V squared over denominator r squared end fraction
  4. fraction numerator epsilon subscript 0 V squared over denominator 4 r squared end fraction

The correct answer is: fraction numerator epsilon subscript 0 V squared over denominator 2 r squared end fraction

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