The wire AB of a meter bridge changes linearly form radius 
to 
from left end to right end. Where should the free end of the galvanometer be connected on AB so that the deflection in the galvanometer is zero?
Text Solution
Verified by ExpertsThe correct answer is:
A
Let the galvanometer be connected at a point 
from end A where 
. Let 
are the resistances of left and right parts of that point. Consider an element of thickness 
at a distance 
from end A of radius 
From the figure,
Resistance of this element will be 
For zero deflection of the galvanometer,
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