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In a potentiometer setup, if the known voltage is increased, what happens to the

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Question: In a potentiometer setup, if the known voltage is increased, what happens to the length of the wire required to balance the unknown voltage?

Options:

  1. It increases
  2. It decreases
  3. It remains the same
  4. It becomes zero

Correct Answer: It increases

Solution: 

If the known voltage is increased, a longer length of wire will be required to balance the unknown voltage, as the potential gradient remains constant.

In a potentiometer setup, if the known voltage is increased, what happens to the

Practice Questions

Q1
In a potentiometer setup, if the known voltage is increased, what happens to the length of the wire required to balance the unknown voltage?
  1. It increases
  2. It decreases
  3. It remains the same
  4. It becomes zero

Questions & Step-by-Step Solutions

In a potentiometer setup, if the known voltage is increased, what happens to the length of the wire required to balance the unknown voltage?
Correct Answer: Length of wire increases
  • Step 1: Understand that a potentiometer is used to measure voltage by comparing it to a known voltage.
  • Step 2: Recognize that the known voltage is applied across a wire, creating a potential gradient (voltage per unit length).
  • Step 3: If the known voltage is increased, the potential gradient along the wire also increases.
  • Step 4: To balance the unknown voltage, you need to find a point on the wire where the voltage matches the unknown voltage.
  • Step 5: Since the potential gradient is higher with the increased known voltage, you will need a longer length of wire to reach the same voltage as the unknown voltage.
  • Step 6: Therefore, if the known voltage is increased, a longer length of wire is required to balance the unknown voltage.
  • Potential Gradient – The potential gradient in a potentiometer is the ratio of voltage to length of the wire, which remains constant in this scenario.
  • Balancing Condition – The balancing condition in a potentiometer requires that the lengths of wire correspond to the voltages being compared.
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