NEET Exam > NEET Videos > Physics Class 12 > Potentiometer: Comparison of EMF
Potentiometer: Comparison of EMF Video Lecture | Physics Class 12 - NEET
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FAQs on Potentiometer: Comparison of EMF Video Lecture - Physics Class 12 - NEET
| 1. What is a potentiometer and how is it used to compare EMF? |  |
Ans. A potentiometer is an instrument used to measure the electromotive force (EMF) of a battery or other voltage sources by comparing it to a known reference voltage. It operates on the principle of null voltage method, where the voltage across a known resistor is adjusted until it equals the EMF of the source being tested. When the two voltages balance, the reading on the scale gives a direct comparison of the EMF.
| 2. What are the advantages of using a potentiometer for EMF comparison? | |
Ans. The advantages of using a potentiometer include high accuracy and precision in measuring EMF without drawing any current from the source being tested, which prevents loading effects. It allows for the measurement of small voltage differences and can be used to compare the EMF of multiple sources simultaneously.
| 3. How do you set up a potentiometer circuit for EMF comparison? | |
Ans. To set up a potentiometer circuit, connect a stable voltage source (like a standard cell) across a long wire, which serves as the potentiometer wire. Connect the galvanometer in parallel with the point on the wire where you want to measure the EMF of the unknown source. Adjust the sliding contact (or jockey) along the wire until the galvanometer reads zero, indicating a balance between the two EMFs.
| 4. What is the significance of the null point in a potentiometer? | |
Ans. The null point in a potentiometer is the point at which the galvanometer reads zero, indicating that the potential difference between the two points in the circuit is equal. This point is significant because it allows for an accurate measurement of the EMF without any current flowing, thus ensuring that the measurement is not affected by internal resistance or loading effects of the source being tested.
| 5. Can a potentiometer be used for measuring AC voltages as well as DC voltages? | |
Ans. A standard potentiometer is primarily designed for measuring DC voltages. However, there are specialized types of potentiometers, such as AC potentiometers, that are designed to measure alternating current voltages. These devices use additional circuitry to adapt the measurement technique for AC signals, allowing for accurate EMF comparisons even in AC applications.
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Jan 12, 2025
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