Physics-
General
Easy

Question

In the given figure distance of the point from A where the electric field is zero is

  1. 20 cm    
  2. 10 cm    
  3. 33 cm    
  4. None of these    

The correct answer is: 33 cm


    Suppose electric field is zero at N. Hence |EA| = |EB|

    Which gives x subscript 1 end subscript equals fraction numerator x over denominator square root of fraction numerator Q subscript 2 end subscript over denominator Q subscript 1 end subscript end fraction end root plus 1 end fraction equals fraction numerator 80 over denominator square root of fraction numerator 20 over denominator 10 end fraction end root plus 1 end fraction equals 33 c m

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