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AP EAMCET2002PhysicsCurrent Electricity

The balancing length for a cell is 560 ~cm in a potentiometer experiment. When an external resistance of 10 is connected in parallel to the cell, the balancing length changes by 60 ~cm . The internal resistance of the cell in ohms, is

Options

  1. A1.6
  2. B1.4
  3. C1.2
  4. D0.12

Correct answer

C. 1.2

Step-by-step solution

aligned & l₁=560 ~cm & l₂=500 ~cm , R=10 aligned Internal resistance aligned r & = ( l₁-l₂ l₂ ) R & = 560-500 500 10 60 600 10= 6 5 & =1.2 aligned

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