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In experiment of the potentiometer wire A B of length 100 cm has a resistance of 10capital omega, It is connected in series with a resistance R and a cell of emf 2 volts and of negligible internal resistance. A Source of emf 10mV is balanced against a length of 40 cm of the potentiometer wire. What is the value of the external resistance?

  1. 900capital omega    
  2. 820capital omega    
  3. 790capital omega    
  4. 670capital omega    

The correct answer is: 790capital omega

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