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Question

A point source of electromagnetic radiation has an average power output of 800W. The maximum value of electric field at a distance 3.5 m from the source will be 62.6 V/m, the energy density at a distance 3.5 m from the source will be - (in joule/m3)

  1. 1.73 cross times 10 to the power of negative 5 end exponent    
  2. 1.73 cross times 10 to the power of negative 6 end exponent    
  3. 1.73 cross times 10 to the power of negative 7 end exponent    
  4. 1.73 cross times 10 to the power of negative 8 end exponent    

The correct answer is: 1.73 cross times 10 to the power of negative 8 end exponent

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