What happens to the current through the galvanometer when the Wheatstone bridge is perfectly balanced?
Correct Answer: Current through the galvanometer is zero.
- Step 1: Understand what a Wheatstone bridge is. It is a circuit used to measure unknown electrical resistances.
- Step 2: Know that the Wheatstone bridge has four resistors arranged in a diamond shape.
- Step 3: Realize that a galvanometer is a device used to detect small currents in the circuit.
- Step 4: Learn that the bridge is considered 'balanced' when the ratio of the resistances in one branch is equal to the ratio in the other branch.
- Step 5: When the bridge is balanced, the voltage across the galvanometer becomes zero.
- Step 6: Since there is no voltage across the galvanometer, no current can flow through it.
- Step 7: Therefore, when the Wheatstone bridge is perfectly balanced, the current through the galvanometer is zero.
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