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Easy

Question

Three charges –q1, +q2 and –q3 are placed as shown in the figure. The x-component of the force on –q1 is proportional to

  1. fraction numerator q subscript 2 end subscript over denominator b to the power of 2 end exponent end fraction plus fraction numerator q subscript 3 end subscript over denominator a to the power of 2 end exponent end fraction sin invisible function application theta    
  2. fraction numerator q subscript 2 end subscript over denominator b to the power of 2 end exponent end fraction plus fraction numerator q subscript 3 end subscript over denominator a to the power of 2 end exponent end fraction cos invisible function application theta    
  3. fraction numerator q subscript 2 end subscript over denominator b to the power of 2 end exponent end fraction minus fraction numerator a subscript 3 end subscript over denominator a to the power of 2 end exponent end fraction sin invisible function application theta    
  4. fraction numerator q subscript 2 end subscript over denominator b to the power of 2 end exponent end fraction minus fraction numerator q subscript 3 end subscript over denominator a to the power of 2 end exponent end fraction cos invisible function application theta    

The correct answer is: fraction numerator q subscript 2 end subscript over denominator b to the power of 2 end exponent end fraction plus fraction numerator q subscript 3 end subscript over denominator a to the power of 2 end exponent end fraction sin invisible function application theta

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