In a meter bridge, the wire of length 1 m has a non-uniform cross section such that the variation \(\frac{{{\rm{dR}}}}{{{\rm{dl}}}}\) of its resistance R with length l is\(\frac{{dR}}{{dl}} \propto \frac{1}{{\sqrt l }}\). Two equal resistance are connected as shown in the figure. The galvanometer has zero deflection when the jockey is at point P. What is the length AP?

In a meter bridge, the wire of length 1 m has a non-uniform cross sect

1.	In a meter bridge, the wire of length 1 m has a non-uniform cross section such that the variation \(\frac{{{\rm{dR}}}}{{{\rm{dl}}}}\) of its resistance R with length l is\(\frac{{dR}}{{dl}} \propto \frac{1}{{\sqrt l }}\). Two equal resistance 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.	0.3 m
B.	0.25 m
C.	0.2 m
D.	0.35 m
Answer» C. 0.2 m

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