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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

2.4

b

3.6

c

0.6

d

1.2

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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