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If a potentiometer is used to measure the EMF of a cell and the balance point is

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Question: If a potentiometer is used to measure the EMF of a cell and the balance point is found at 3 m, what can be inferred about the cell\'s EMF if the potential gradient is 1.5 V/m?

Options:

  1. 1.5 V
  2. 3 V
  3. 4.5 V
  4. 6 V

Correct Answer: 4.5 V

Solution: 

The EMF of the cell can be calculated as EMF = potential gradient × length = 1.5 V/m × 3 m = 4.5 V.

If a potentiometer is used to measure the EMF of a cell and the balance point is

Practice Questions

Q1
If a potentiometer is used to measure the EMF of a cell and the balance point is found at 3 m, what can be inferred about the cell's EMF if the potential gradient is 1.5 V/m?
  1. 1.5 V
  2. 3 V
  3. 4.5 V
  4. 6 V

Questions & Step-by-Step Solutions

If a potentiometer is used to measure the EMF of a cell and the balance point is found at 3 m, what can be inferred about the cell's EMF if the potential gradient is 1.5 V/m?
Correct Answer: 4.5 V
  • Step 1: Understand that the EMF (Electromotive Force) of a cell can be calculated using the formula: EMF = potential gradient × length.
  • Step 2: Identify the values given in the question. The potential gradient is 1.5 V/m and the length at which the balance point is found is 3 m.
  • Step 3: Substitute the values into the formula. EMF = 1.5 V/m × 3 m.
  • Step 4: Perform the multiplication. 1.5 multiplied by 3 equals 4.5.
  • Step 5: Conclude that the EMF of the cell is 4.5 V.
  • Potentiometer – A device used to measure the electromotive force (EMF) of a cell by balancing it against a known potential gradient.
  • Potential Gradient – The change in electric potential per unit length, which is used to determine the EMF when multiplied by the length at which the balance point is found.
  • Electromotive Force (EMF) – The voltage generated by a cell or battery, which can be measured using a potentiometer.
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