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What are the advantages of the null-poin...

What are the advantages of the null-point method in a Wheatstone bridge ? What additional measurements would be required to calculte `R_("unknown ") ` by any onther method ?

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In Wheatstone bridge advantage of null point method is that there is no change in position of null point due to resistance of galvanometer. Hence, there is no need to determine current in resistance or internal resistance of galvanometer.
This method is easy and comfortable for observer.
In an another method to determine unknown resistance Kirchhoff.s laws are used For these precise current measurement is to be done through all branches of resistors, galvanometer and internal resistance of galvanometer.
Note : Necessary and required condition for balance of Wheatstone bridge,
`(P)/(Q) = (R)/(S)`
where P and Q is ratio of length, R is unknown resistor and S is known resistor.
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