Question

What does 'null deflection' mean in the context of a Wheatstone bridge?

Options

• A situation where the bridge is completely disconnected

• A condition where the battery stops supplying current

• A state where all resistances are equal

• A condition in which the galvanometer shows zero deflection because no current flows through it

Answer 1

Null deflection is a condition in which the galvanometer shows zero deflection because no current flows through it. This occurs when the potentials at the two galvanometer junctions are equal, which is the basis of the balance condition in a Wheatstone bridge.