The total length of potentiometer wire AB is 50 cm in the arrangement as shown in figure. If 
is the point where the galvanometer shows zero reading then the length 
is 
cm.
Text Solution
Verified by ExpertsThe correct answer is:
B
In this potentiometer, for zero galvanometer reading, the potential at P must equal the potential at the junction between the 
and 
resistors.
The voltage distribution across the resistors is 
from point A .
Since the potentiometer wire is uniform with length 50 cm , the potential distribution is also uniform.
Therefore, 
, giving 
.
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