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In a meter bridge, the wire of length...

In a meter bridge, the wire of length 1 m has a non- uniform cross - section such that , the variation `(dR)/(dl)` of its resistance R with length l is `(dR)/(dl) prop (1)/(sqrt(l))` ,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

`0.2m`

B

`0.3`m

C

`0.25m`

D

`0.35`m

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