Solution:
Pressing the key does not disturb current in all resistances as the bridge is balanced. Therefore, deflection in the galvanometer in whatever direction it was, will stay.
In the following Wheatstone bridge, P/Q = R/S. If key K is closed, then the galvanometer will show deflection
In the following Wheatstone bridge, P/Q = R/S. If key K is closed, then the galvanometer will show deflection
