In a meter bridge, the wire of length 
has a non-uniform cross-section such that, the variation 
of its resistance R with length 
is 
Two equal resistances are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P What is the length AP ?
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
C
JEE Main 2019
We have given
(where k is constant)
Let 
and 
be the resistance of AP and PB respectively.
Using Wheatstone bridge principle
or 
Now, 
Putting 
i.e. 
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