When using a potentiometer to measure an unknown voltage, what is the condition for balance?
Correct Answer: The potential difference across the galvanometer is zero.
- Step 1: Understand that a potentiometer is a device used to measure voltage.
- Step 2: Know that the potentiometer has a wire with a known voltage across it.
- Step 3: Connect the unknown voltage to one end of the potentiometer wire.
- Step 4: Use a galvanometer to detect the current between the potentiometer wire and the unknown voltage.
- Step 5: Adjust the position on the potentiometer wire until the galvanometer shows zero current.
- Step 6: Recognize that when the galvanometer reads zero, the voltage across the potentiometer wire equals the unknown voltage.
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