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Question

Two spherical, nonconducting, and very thin shells of uniformly distributed positive charge Q and radius d are located a distance 10d from each other. A positive point charge q is placed inside one of the shells at a distance d/2 from the center, on the line connecting the centers of the two shells, as shown in the figure. What is the net force on the charge q?

  1. fraction numerator q Q over denominator 361 pi epsilon subscript 0 end subscript d to the power of 2 end exponent end fraction text  to the left end text    
  2. fraction numerator q Q over denominator 361 pi epsilon subscript 0 end subscript d to the power of 2 end exponent end fraction text  to the right end text    
  3. fraction numerator 362 q Q over denominator 361 pi epsilon subscript 0 end subscript d to the power of 2 end exponent end fraction text  to the left end text    
  4. fraction numerator 360 q Q over denominator 361 pi epsilon subscript 0 end subscript d to the power of 2 end exponent end fraction text  to the right end text    

The correct answer is: fraction numerator q Q over denominator 361 pi epsilon subscript 0 end subscript d to the power of 2 end exponent end fraction text  to the left end text

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