In a potentiometer experiment, if the known voltage is increased, what effect does it have on the balance point?
Correct Answer: Balance point moves towards the positive terminal.
- Step 1: Understand that a potentiometer is used to measure voltage by balancing it against a known voltage.
- Step 2: Recognize that the balance point is where the voltage across a certain length of wire equals the known voltage.
- Step 3: When the known voltage is increased, it means we need more voltage to reach balance.
- Step 4: Since the potentiometer wire has a uniform resistance, a higher voltage requires a longer length of wire to achieve the same voltage drop.
- Step 5: Therefore, the balance point will move towards the positive terminal of the known voltage source, indicating that more wire length is needed.
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