Question
In the meter bridge experiment, balance point was observed at J with AJ = l.
(i) The values of R and X were doubled and then interchanged. What would be the new position of balance point?
(ii) If the galvanometer and battery are interchanged at the balance position, how will the balance point get affected?
Solution
i) Balance point is obtained by, 
When both R and X are doubled and then interchanged, new balance length becomes l’ which is given by,
Now, from the above two equations, we have
ii) The balance point will not get affected if galvanometer and balance point are interchanged at this position.
