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When using a potentiometer to measure the emf of a cell, what condition must be

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Question: When using a potentiometer to measure the emf of a cell, what condition must be satisfied?

Options:

  1. The circuit must be closed
  2. The circuit must be open
  3. The cell must be short-circuited
  4. The cell must be connected in series

Correct Answer: The circuit must be open

Solution: 

The circuit must be open when measuring the emf of a cell with a potentiometer to ensure that no current flows through the cell, allowing for an accurate measurement.

When using a potentiometer to measure the emf of a cell, what condition must be

Practice Questions

Q1
When using a potentiometer to measure the emf of a cell, what condition must be satisfied?
  1. The circuit must be closed
  2. The circuit must be open
  3. The cell must be short-circuited
  4. The cell must be connected in series

Questions & Step-by-Step Solutions

When using a potentiometer to measure the emf of a cell, what condition must be satisfied?
Correct Answer: Circuit must be open.
  • Step 1: Understand what a potentiometer is. It is a device used to measure the electromotive force (emf) of a cell.
  • Step 2: Know that emf is the voltage provided by a cell when no current is flowing.
  • Step 3: Realize that to measure the emf accurately, you need to prevent any current from flowing through the cell.
  • Step 4: Ensure that the circuit is open, meaning there should be no complete path for current to flow.
  • Step 5: With the circuit open, connect the potentiometer to the cell to measure the emf.
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