मराठी

It is observed in a potentiometer experiment that no current passes through the galvanometer -

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प्रश्न

It is observed in a potentiometer experiment that no current passes through the galvanometer when the terminals of the cell are connected across a certain length of the potentiometer wire. On shunting the cell by a 2 Ω resistance, the balancing length is reduced to half. The internal resistance of the cell is ______.

पर्याय

  • 2 Ω

  • 18 Ω

  • 9 Ω

  • 4 Ω

MCQ
रिकाम्या जागा भरा

उत्तर

It is observed in a potentiometer experiment that no current passes through the galvanometer, when the terminals of the cell are connected across a certain length of the potentiometer wire. On shunting the cell by a 2 Ω resistance, the balancing length is reduced to half. The internal resistance of the cell is 2 Ω.

Explanation:

The internal resistance of the cell is given by:

r = `("I"_1/"I"_2 - 1) xx "R"`

r = `((2"I"_1)/"I"_1 - 1) xx "R"`

`=> "r" = (2 - 1) xx "R"`

r = R = 2Ω

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Potentiometer
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