Question

If in an experiment of Wheatstone bridge, the positions of cells and galvanometer are interchanged, then the balance points will

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

Answer 1

Answer: (B)

When Wheatstone bridge is balanced,
$\frac{P}{Q}=\frac{R}{S}$ or $\frac{P}{R}=\frac{Q}{S}$
If the galvanometer is replaced with a cell in balanced Wheatstone bridge, the condition for balanced bridge will be $P/R=Q/S$, which is there.
Hence, balance point will remain unchanged, where galvanometer shows no current.