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In a potentiometer experiment the balancing with a cell is at length 240 ~cm . On shunting the cell with a resistance of 2 the balancing length becomes 120 ~cm . The internal resistance of the cell is

Options

  1. A1
  2. B0.5
  3. C4
  4. D2

Correct answer

D. 2

Step-by-step solution

r = R [ ₁ ₂ -1 ]=2 [ 240 120 -1 ]=2

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