Question

What is the main difference between a balanced and an unbalanced Wheatstone bridge in terms of galvanometer deflection?

Options

• An unbalanced bridge shows zero deflection, while a balanced bridge shows non-zero deflection

• A balanced bridge shows zero deflection, while an unbalanced bridge shows non-zero deflection

• Both show the same deflection

• Neither shows any deflection

Answer 1

In a balanced Wheatstone bridge, the galvanometer shows zero deflection because no current flows through it (\[I_g = 0\]). In an unbalanced bridge, the galvanometer shows non-zero deflection because current flows through it due to a non-zero potential difference between the two junctions.