Question: In a potentiometer experiment, if the balance point is found at 4 m with a known voltage of 12 V, what is the unknown voltage if the balance point for it is at 6 m?

Options:

1. 8 V
2. 9 V
3. 18 V
4. 24 V

Correct Answer: 18 V

Solution:

Using the formula V1/L1 = V2/L2, we have 12 V / 4 m = V2 / 6 m. Solving gives V2 = 18 V.