In a Wheatstone bridge, if the bridge is unbalanced, what happens to the current

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Question: In a Wheatstone bridge, if the bridge is unbalanced, what happens to the current through the galvanometer?

Options:

Correct Answer: It increases

Solution:

When the Wheatstone bridge is unbalanced, a current flows through the galvanometer, indicating a difference in potential across it.

In a Wheatstone bridge, if the bridge is unbalanced, what happens to the current through the galvanometer?

In a Wheatstone bridge, if the bridge is unbalanced, what happens to the current through the galvanometer?

Correct Answer: Current flows through the galvanometer.

Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances by balancing two legs of a bridge circuit.
Step 2: Know that the bridge has four resistors arranged in a diamond shape, with a galvanometer connected between the two midpoints.
Step 3: Recognize that when the bridge is balanced, the voltage across the galvanometer is zero, meaning no current flows through it.
Step 4: Learn that if the resistances are not equal (unbalanced), there will be a difference in voltage between the two midpoints.
Step 5: Understand that this voltage difference causes a current to flow through the galvanometer.
Step 6: Conclude that when the Wheatstone bridge is unbalanced, the current through the galvanometer indicates that there is a difference in potential.

Wheatstone Bridge – A circuit used to measure unknown electrical resistances by balancing two legs of a bridge circuit.
Galvanometer – An instrument for detecting and measuring small electric currents.
Unbalanced Bridge – A condition in which the ratio of resistances in one leg of the bridge does not equal the ratio in the other leg, resulting in a current through the galvanometer.