The length of a potentiometer wires is l. A cell of emf E is balanced at a length 
from positive end of the wire. If the length of the wire is increased by 
, the distance at which the same cell gives the balancing point is
(Cell in the primary is ideal and no series resistance is present in the primary circuit.)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
We have, 
……… (i)
Where, 
(ii) 
When, length of potentiometer wire is increased by 
, then new length,
New potential gradient,
If l' be the new balancing
length, then, 
or 
from Eq.(iii), 
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