In a potentiometer experiment, if the balance point is found at 4 m for a cell of unknown emf, what is the emf if the potential gradient is 2 V/m?

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Q: In a potentiometer experiment, if the balance point is found at 4 m for a cell of unknown emf, what is the emf if the potential gradient is 2 V/m?

Solution: The emf can be calculated using the formula: emf = potential gradient × length. Here, emf = 2 V/m × 4 m = 8 V.

Steps: 5

Step 1: Identify the given values from the problem. We have a balance point at 4 meters and a potential gradient of 2 volts per meter.
Step 2: Write down the formula to calculate the electromotive force (emf). The formula is: emf = potential gradient × length.
Step 3: Substitute the values into the formula. Here, potential gradient is 2 V/m and length is 4 m.
Step 4: Perform the multiplication: 2 V/m × 4 m = 8 V.
Step 5: Conclude that the emf of the cell is 8 volts.