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Question

If a charge q is moving towards the centre of an earthed conducting sphere of radius b with uniform velocity v. Distance of two points A and B from centre of sphere are 3a&2a. Conducting sphere is earthed with an ammeter and resistance in series (as shown)

Net charge on surface of conductor at this instant

  1. +q    
  2. -q    
  3. negative q fraction numerator x over denominator b end fraction    
  4. negative q fraction numerator b over denominator x end fraction    

The correct answer is: negative q fraction numerator b over denominator x end fraction

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