In a meter bridge, the wire of length 1m has a non–uniform cross–section such that, the variation 
of its resistance R with length λ 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?
Text Solution
Verified by ExpertsThe correct answer is:
C
For the given wire : 
, where 
constant.
Let resistance of part AP is 
and PB is 
or 
By balanced
WSB concept.
Now 
Putting 
i.e. 
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