Question

If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance point will

• A. change
• B. remain unchanged
• C. depend on the internal resistance of cell and resistance of galvanometer
• D. none of these

Answer 1

The correct option is B remain unchanged

For balanced Wheatstone bridge which is shown in figure a, $\frac{P}{Q}=\frac{S}{R}$
If we interchange the cell and galvanometer then circuit becomes as shown in figure b.
and balanced condition, $\frac{P}{S}=\frac{Q}{R}\Rightarrow \frac{P}{Q}=\frac{S}{R}$
Thus, balanced point remains unchanged.