Q139 / 170 · Manipal (MET) 2016 · Physics

In a potentiometer experiment for measuring the emf of a cell, the null point is at 240 cm when we have a $500 \Omega$ resistor in series with the cell and galvanometer. If the series resistance reduced to half, then the null point will be at

  • A
    480 cm
  • Correct answer
    B
    240 cm
  • C
    120 cm
  • D
    60 cm

Solution

The resistance in series with galvanometer does not affect the null point. So, it will obtained at 240 cm .

Hence, the correct answer is option: 'B'.

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