In the potentiometer arrangement shown, the driving cell 
has emf 
and internal resistance 
. The emf of the cell 
is 
and internal resistance 
. The potentiometer wire CD is 100 cm long. If balance is obtained with length 
, then
A
cm
B
cm
C
cm
D
Balance cannot be obtained
Text Solution
Verified by ExpertsThe correct answer is:
B
As potential gradient 
in the potentiometer wire will be less than 
) 
because of presence of 
So for the battery of emf 
the balance point 1 will be greater than 50 cm as shown.
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