Question
In a meter bridge shown in the figure, the balance point is found to be 40 cm from end A. If a resistance of 10 is connected in series with R, balance point is obtained 60 cm from A. Calculate the values of R and S. 
Solution
For null point, balance length l1 = 40 cm
So, 
... (1)
If resistance 10 
is connected in series of R, balance point shifts towards AD = 60 cm.
From equations (1) and (2), we have
From equation (1), we have
