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Question

Electric field strength due to a point charge of 5 mu C at a distance of 80 cm from the charge is

  1. 8 cross times 1 0 to the power of 4 end exponentN/C    
  2. 7 cross times 1 0 to the power of 4 end exponentN/C    
  3. 5 cross times 1 0 to the power of 4 end exponentN/C    
  4. 4 cross times 1 0 to the power of 4 end exponentN/C    

The correct answer is: 7 cross times 1 0 to the power of 4 end exponentN/C


    E equals 9 cross times 1 0 to the power of 9 end exponent. fraction numerator Q over denominator r to the power of 2 end exponent end fraction equals 9 cross times 1 0 to the power of 9 end exponent cross times fraction numerator 5 cross times 1 0 to the power of negative 6 end exponent over denominator left parenthesis 0.8 right parenthesis to the power of 2 end exponent end fraction equals 7 cross times 1 0 to the power of 4 end exponent N rightwards arrow over short leftwards arrow divided by rightwards arrow over short leftwards arrow C

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