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If the length of the potentiometer wire is increased while keeping the voltage c

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Question: If the length of the potentiometer wire is increased while keeping the voltage constant, what will happen to the balance point when measuring a cell\'s EMF?

Options:

  1. It will move to a longer length.
  2. It will move to a shorter length.
  3. It will remain unchanged.
  4. It will become unstable.

Correct Answer: It will move to a longer length.

Solution: 

Increasing the length of the potentiometer wire while keeping the voltage constant will increase the balance point length for the same EMF.

If the length of the potentiometer wire is increased while keeping the voltage c

Practice Questions

Q1
If the length of the potentiometer wire is increased while keeping the voltage constant, what will happen to the balance point when measuring a cell's EMF?
  1. It will move to a longer length.
  2. It will move to a shorter length.
  3. It will remain unchanged.
  4. It will become unstable.

Questions & Step-by-Step Solutions

If the length of the potentiometer wire is increased while keeping the voltage constant, what will happen to the balance point when measuring a cell's EMF?
Correct Answer: Balance point length will increase.
  • Step 1: Understand what a potentiometer is. It is a device used to measure the electromotive force (EMF) of a cell by comparing it to a known voltage.
  • Step 2: Know that the balance point is the point on the potentiometer wire where the voltage across the wire equals the EMF of the cell being measured.
  • Step 3: Realize that the voltage across the potentiometer wire is determined by the length of the wire and the total voltage applied to it.
  • Step 4: If you increase the length of the potentiometer wire while keeping the voltage constant, the voltage per unit length of the wire decreases.
  • Step 5: Since the voltage per unit length is lower, it will take a longer length of wire to reach the same voltage as the EMF of the cell.
  • Step 6: Therefore, the balance point will move further along the wire, meaning it will increase.
  • Potentiometer Principle – A potentiometer measures the EMF of a cell by balancing it against a known voltage, where the balance point is directly related to the length of the wire and the voltage applied.
  • Ohm's Law – The relationship between voltage, current, and resistance, which is relevant when considering how changes in wire length affect the balance point.
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