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Q.

In a potentiometer experiment, the balancing length with a cell is 560 cm . When an external resistance of 10Ω  is connected in parallel to the cell, the balancing length changes to 412 cm  . the internal resistance of the cell in ohm  is

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a

3.6

b

2.4

c

1.2

d

0.6

answer is A.

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Detailed Solution

Balancing length l1=560 cm Balancing length l2=412 cm Resistance R=10 Ω Internal resistance r=?    r=(l1−l2l2)R       =560−412412×10       =3.59Ω ∴  r=3.6 Ω
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