What happens to the potential difference across a segment of a potentiometer wire if the length of that segment is halved?
Correct Answer: Potential difference halves.
- Step 1: Understand what a potentiometer wire is. It is a long wire that can measure voltage differences.
- Step 2: Know that the potential difference (voltage) across a segment of the wire depends on its length.
- Step 3: Recognize that the potential gradient (voltage per unit length) is constant along the wire.
- Step 4: If you halve the length of the segment, you are taking a shorter piece of the wire.
- Step 5: Since the potential gradient is constant, a shorter segment will have a smaller potential difference.
- Step 6: Therefore, if the length is halved, the potential difference across that segment also halves.
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