Question
The balancing length for a cell is 560 cm in a potentiometer experiment. When an external resistance of 10 ohm is connected in parallel to the cell the balancing length changes by 60 cm. The internal resistance of the cell in ohms is
Answer: Option C
:
C
rR=l1−l2l2
here R=10 ohm
l1 = 560cm
l2 =560-60=500cm
r=R×(l1−l2l2)
=10×(560−500500)
=1.2ohm
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:
C
rR=l1−l2l2
here R=10 ohm
l1 = 560cm
l2 =560-60=500cm
r=R×(l1−l2l2)
=10×(560−500500)
=1.2ohm
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