Question

What would happen if the galvanometer in a Wheatstone bridge were replaced with a voltmeter?

Options

• The voltmeter would show zero voltage when the bridge is balanced and non-zero voltage when unbalanced

• The voltmeter would measure only the battery voltage

• The voltmeter reading would remain constant regardless of the bridge condition

• The voltmeter could not function in a Wheatstone bridge circuit

Answer 1

If a voltmeter replaced the galvanometer, it would show zero voltage when the bridge is balanced (because the two junctions are at equal potential) and non-zero voltage when the bridge is unbalanced. This principle is sometimes used in practical applications where a voltmeter can indicate the degree of imbalance in the bridge.