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Question

Two identical solid copper spheres of radius R are placed in contact with each other. The, gravitational force between them is proportional to

  1. R to the power of 2 end exponent,    
  2. straight R to the power of negative 2 end exponent
  3. R to the power of negative 4 end exponent    
  4. R to the power of 4 end exponent    

The correct answer is: R to the power of negative 4 end exponent

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