What happens to the reading of a potentiometer if the wire is heated and its resistance increases?
Correct Answer: Reading decreases
- Step 1: Understand what a potentiometer is. It measures voltage in a circuit.
- Step 2: Know that a potentiometer has a wire that can change its resistance.
- Step 3: When the wire is heated, its resistance increases.
- Step 4: An increase in resistance means that less current can flow through the wire.
- Step 5: The potential gradient (voltage per unit length) of the wire is affected by the current.
- Step 6: If the potential gradient decreases, the reading on the potentiometer also decreases.
- Step 7: Therefore, when the wire is heated and its resistance increases, the reading of the potentiometer decreases.
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