Question

In a Wheatstone bridge, what happens when the galvanometer shows zero deflection?

Options

• The two junctions connected to the galvanometer are at the same potential

• The battery voltage becomes zero

• All four resistances become equal

• The current from the battery stops flowing

Answer 1

When the galvanometer shows zero deflection, the two junctions connected to it (the midpoints of the bridge arms) are at the same potential. This equality of potentials means no potential difference exists across the galvanometer, so no current flows through it, and the balance condition can be applied.