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General
Easy

Question

What is the potential energy of the equal positive point charges of 1 mu C each held 1 m apart in air

  1. 9 cross times 1 0 to the power of negative 3 end exponent J    
  2. 9 cross times 1 0 to the power of negative 3 end exponent e V    
  3. 2 e V divided by m    
  4. Zero    

The correct answer is: 9 cross times 1 0 to the power of negative 3 end exponent J


    By using U equals 9 cross times 1 0 to the power of 9 end exponent fraction numerator Q subscript 1 end subscript Q subscript 2 end subscript over denominator r end fraction
    Þ U equals 9 cross times 1 0 to the power of 9 end exponent cross times fraction numerator 1 0 to the power of negative 6 end exponent cross times 1 0 to the power of negative 6 end exponent over denominator 1 end fraction equals 9 cross times 1 0 to the power of negative 3 end exponent J

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