What happens to the current through the galvanometer when the Wheatstone bridge is 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 resistances.
- Step 2: Know that the Wheatstone bridge has four resistors and a galvanometer (a device that measures current).
- Step 3: When the bridge is balanced, it means the ratio of the two resistors on one side is equal to the ratio of the two resistors on the other side.
- Step 4: When the bridge is balanced, the voltage (or potential difference) across the galvanometer becomes zero.
- Step 5: Since the voltage across the galvanometer is zero, no current can flow through it.
- Step 6: Therefore, when the Wheatstone bridge is balanced, the current through the galvanometer is zero.
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