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If the emf of a cell is 12 V and the potentiometer wire is 20 m long, what is th

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Question: If the emf of a cell is 12 V and the potentiometer wire is 20 m long, what is the potential gradient if the wire is calibrated to give a reading of 0.6 V/m?

Options:

  1. 12 V
  2. 0.6 V/m
  3. 0.3 V/m
  4. 0.5 V/m

Correct Answer: 0.6 V/m

Solution: 

The potential gradient is given as 0.6 V/m, which is the calibration value for the potentiometer.

If the emf of a cell is 12 V and the potentiometer wire is 20 m long, what is th

Practice Questions

Q1
If the emf of a cell is 12 V and the potentiometer wire is 20 m long, what is the potential gradient if the wire is calibrated to give a reading of 0.6 V/m?
  1. 12 V
  2. 0.6 V/m
  3. 0.3 V/m
  4. 0.5 V/m

Questions & Step-by-Step Solutions

If the emf of a cell is 12 V and the potentiometer wire is 20 m long, what is the potential gradient if the wire is calibrated to give a reading of 0.6 V/m?
Correct Answer: 0.6 V/m
  • Step 1: Understand what emf means. Emf stands for electromotive force, which is the voltage provided by a cell.
  • Step 2: Note the given values. The emf of the cell is 12 V and the length of the potentiometer wire is 20 m.
  • Step 3: Recognize that the potential gradient is a measure of how much voltage is present per unit length of the wire.
  • Step 4: Look at the calibration value provided for the potentiometer, which is 0.6 V/m.
  • Step 5: Conclude that the potential gradient is equal to the calibration value of the potentiometer, which is 0.6 V/m.
  • Electromotive Force (emf) – The emf of a cell is the voltage provided by the cell when no current is flowing.
  • Potential Gradient – The potential gradient is the change in electric potential per unit length, often expressed in volts per meter (V/m).
  • Potentiometer Calibration – A potentiometer is calibrated to measure voltage by providing a known potential gradient along a wire.
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