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Question
In the potentiometer experiment, the balancing length with a cell E1 of unknown e.m.f. is 'ℓ1' cm. By shunting the cell with resistance R Ω, the balancing length becomes `ℓ_1/2` cm, the internal resistance (r) of a cell is ______
Options
r = 2R
r = 0
r = `R/2`
r = R
MCQ
Fill in the Blanks
Solution
In the potentiometer experiment, the balancing length with a cell E1 of unknown e.m.f. is 'ℓ1' cm. By shunting the cell with resistance R Ω, the balancing length becomes `ℓ_1/2` cm, the internal resistance (r) of a cell is r = R.
Explanation:
r = `R(ℓ_1/ℓ_2 - 1) ℓ_2 = ℓ_1/2`
Putting the values and solving we get
r = R
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Potentiometer
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