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KCET2019PhysicsCurrent Electricity

In a potentiometer experiment, the balancing point with a cell is at a 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. A( 1 )
  2. B( 04 )
  3. C( 0.5 )
  4. D( 2 )

Correct answer

D. ( 2 )

Step-by-step solution

(D) Internal resistance of a cell is ( R ( l₁-l₂ l₂ )=2 ( 240-120 120 )=2 )

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