Physics-
General
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Question

A 12 p F capacitor is connected to a 50V battery. How much electrostatic energy is stored in the capacitor

  1. 1.5 cross times 1 0 to the power of negative 8 end exponent J    
  2. 2.5 cross times 1 0 to the power of negative 7 end exponent J    
  3. 3.5 cross times 1 0 to the power of negative 5 end exponent J    
  4. 4.5 cross times 1 0 to the power of negative 2 end exponent J    

The correct answer is: 1.5 cross times 1 0 to the power of negative 8 end exponent J


    U equals fraction numerator 1 over denominator 2 end fraction C V to the power of 2 end exponent equals fraction numerator 1 over denominator 2 end fraction cross times 12 cross times 1 0 to the power of negative 12 end exponent cross times left parenthesis 50 right parenthesis to the power of 2 end exponent equals 1.5 cross times 1 0 to the power of negative 8 end exponent J

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