What happens to the current through the galvanometer when the Wheatstone bridge is unbalanced?
Correct Answer: Current flows through the galvanometer.
- Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown resistances.
- Step 2: Know that the Wheatstone bridge has four resistors arranged in a diamond shape.
- Step 3: Realize that the galvanometer is connected between the two midpoints of the bridge.
- Step 4: When the bridge is balanced, the potential difference across the galvanometer is zero, so no current flows through it.
- Step 5: When the bridge is unbalanced, the resistances are not equal, creating a difference in voltage between the two midpoints.
- Step 6: This difference in voltage causes a current to flow through the galvanometer.
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