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Find the electric dipole moment of a non-conducting ring of radiusa, made of two semicircular rings having linear charge densities negative 1 and plus 1 as shown in Figure.

  1. 2 lambda a to the power of 2 end exponent    
  2. 4blank lambda a to the power of 2 end exponent    
  3. lambda a to the power of 2 end exponent    
  4. 2 square root of 2 blank lambda a to the power of 2 end exponent    

The correct answer is: 4blank lambda a to the power of 2 end exponent

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