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Question

A 10 m wire potentiometer is connected to an accumulator of steady voltage. A 7.8 m length of it balances the emf of a cell on 'open-circuit'. When cell delivers current through a conductor of resistance 10Ω it is balanced against 7.0 cm of the same poleutomelic. What is the internal resistance of the cell?

  1. 1.24Ω
  2. 1.36Ω
  3. 1.14Ω

The correct answer is: 1.14Ω

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