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In a potentiometer setup, if the known voltage is increased while keeping the le

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Question: In a potentiometer setup, if the known voltage is increased while keeping the length of the wire constant, what happens to the balance point?

Options:

  1. It moves towards the positive terminal
  2. It moves towards the negative terminal
  3. It remains unchanged
  4. It becomes unstable

Correct Answer: It moves towards the positive terminal

Solution: 

If the known voltage is increased, the balance point will move towards the positive terminal, as a higher voltage will require a longer length of wire to achieve balance.

In a potentiometer setup, if the known voltage is increased while keeping the le

Practice Questions

Q1
In a potentiometer setup, if the known voltage is increased while keeping the length of the wire constant, what happens to the balance point?
  1. It moves towards the positive terminal
  2. It moves towards the negative terminal
  3. It remains unchanged
  4. It becomes unstable

Questions & Step-by-Step Solutions

In a potentiometer setup, if the known voltage is increased while keeping the length of the wire constant, what happens to the balance point?
Correct Answer: Balance point moves towards the positive terminal.
  • Step 1: Understand that a potentiometer measures voltage by comparing it to a known voltage.
  • Step 2: Recognize that the balance point is where the voltage across a certain length of wire equals the known voltage.
  • Step 3: If the known voltage is increased, it means we need more voltage to reach balance.
  • Step 4: Since the length of the wire is constant, a higher voltage will require a longer length of wire to achieve balance.
  • Step 5: Therefore, the balance point will move towards the positive terminal of the potentiometer.
  • Potentiometer Principle – The balance point in a potentiometer setup is determined by the ratio of the voltages and the lengths of the wire.
  • Voltage and Length Relationship – An increase in the known voltage requires a longer length of wire to maintain balance, affecting the position of the balance point.
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