Question

In a potentiometer experiment the balancing with a cell is at length 240 cm.

On shunting the cell with a resistance of 2Ω, the balancing length becomes

120 cm. The internal resistance of the cell is

(a) 1 Ω (b) 0.5 Ω (c) 4 Ω (d) 2 Ω​

Answer 1

Answer:

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Answer 2

Answer:

d.2ohm

Internal resistance of a cell r is given by

r=R[ l 2l 1 −1]

⇒r=2[ 120240−1]

⇒r=2×1=2Ω