How does a voltmeter reading of 0V across points A and B on a Wheatstone Bridge affect the bridge?

A voltmeter reading of 0V across points A and B on a Wheatstone bridge indicates that there is no potential difference between these two points. This scenario signifies that the ratio of resistances in the two branches of the bridge is equal, leading to a balanced state. In a balanced Wheatstone bridge, the current flowing through the meter is zero, as there is no voltage to drive a current between points A and B.

When the bridge is balanced, it confirms that the values of the resistors are in such a proportion that they counteract each other effectively. This is crucial in precise measurements, as it allows for accurate readings of unknown resistances. A balanced bridge is essential for ensuring accurate null readings and serves as a foundation for many applications in measuring instruments and circuits.