State how the null condition of the bridge will change when the position of the battery and the galvanometer used in a Wheatstone bridge circuit are altered mutually.

At the point when the position of the battery and the galvanometer utilized as a part of a Wheatstone connect circuit are changed commonly. As the wheatstone connect states that 

P/Q = R/S = l/100-l 

After trade the position of the battery and the galvanometer are changed commonly. 

P/Q = R/S = 100-l/l