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In a potentiometer setup, if the wire is made of a material with higher resistiv

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Question: In a potentiometer setup, if the wire is made of a material with higher resistivity, what effect does it have on the potential gradient?

Options:

  1. It increases
  2. It decreases
  3. It remains unchanged
  4. It becomes infinite

Correct Answer: It decreases

Solution: 

Higher resistivity increases the resistance of the wire, which can lead to a decrease in current and thus affect the potential gradient.

In a potentiometer setup, if the wire is made of a material with higher resistiv

Practice Questions

Q1
In a potentiometer setup, if the wire is made of a material with higher resistivity, what effect does it have on the potential gradient?
  1. It increases
  2. It decreases
  3. It remains unchanged
  4. It becomes infinite

Questions & Step-by-Step Solutions

In a potentiometer setup, if the wire is made of a material with higher resistivity, what effect does it have on the potential gradient?
Correct Answer: Potential gradient decreases.
  • Step 1: Understand what a potentiometer is. It is a device used to measure voltage by comparing it to a known voltage.
  • Step 2: Know that the wire in a potentiometer has a certain resistivity, which affects its resistance.
  • Step 3: Recognize that higher resistivity means the material of the wire has more opposition to the flow of electric current.
  • Step 4: Realize that if the resistance of the wire increases, the current flowing through the wire decreases.
  • Step 5: Understand that the potential gradient is the change in voltage per unit length of the wire.
  • Step 6: Conclude that if the current decreases due to higher resistance, the potential gradient will also decrease because there is less voltage drop across the same length of wire.
  • Potential Gradient – The potential gradient in a potentiometer is the change in potential difference per unit length of the wire.
  • Resistivity – Resistivity is a material property that affects how much resistance a material offers to the flow of electric current.
  • Current and Resistance Relationship – According to Ohm's law, an increase in resistance (due to higher resistivity) can lead to a decrease in current if the voltage remains constant.
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