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Question

Four identical large metal plates are arranged parallel to each other, with equal gaps in between. They are given charges q, 2q, 3q and 4q (counting from any one side). The outermost plates are now shorted. The charge which flows through the shorting wire is

  1. fraction numerator 4 q over denominator 3 end fraction    
  2. fraction numerator 3 q over denominator 4 end fraction    
  3. fraction numerator 5 q over denominator 3 end fraction    
  4. None    

The correct answer is: fraction numerator 5 q over denominator 3 end fraction

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