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?
12 V
0.6 V/m
0.3 V/m
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.
