VIVA QUESTIONS:
(1) Why is a potentiometer so named?
we prefer potentiometer over voltmeter to measure emf of a cell?
be greater than the
[2] Why do we prefer potentio
Ezplain why the emf of driver cell in the potentiometer experiment should be greater the
emf of the cell to be determined.
e current should not be passed through a potentiometer wire for a long time
why should we prefer potentiometer wire of longer length?
[6] Copper wire is not used in the potentiometer. Explain.
Why the jockey should not be rubbed against the potentiometer wire?
12) What is meant by potential gradient of potentiometer wire? On
wetentiometer wire? On what factors, does it depende
V
state whether the electric field along potentiometer wire is constant or variable.
0 What is the significance of null deflection in the galvanometer in the potentiometer
experiment?
Answers
Answer:
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Explanation:
1.
The measuring instrument called a potentiometer is, in reality, a voltage divider used for measuring electric powered capacity (voltage); the aspect is an implementation of the same principle, for this reason, its name.
The potentiometer is called an ideal voltmeter because unlike voltmeter it does not draw the current from the main circuit.
The voltmeter draws current from the main circuit to measure the voltage across the circuit element. Thus the accuracy of the measurement is affected.
2. Potentiometer works best when the potential drop per unit length is less.
If you increase the length of wire, potential drop per unit length decreases and it increases the sensitivity of the potentiometer.
6.
Copper being a superb conductor, won't show a nicely dropping potential along its length.
Rubbing the wire with jockey will cause a decrease within the cross-sectional area of the wire in several parts. The resistance in several portions of wire will become different. This is often opposite to the belief of the potentiometer.
12. Potential Gradient is the decrease in potential per unit length. It’s calculated as V / L, where V is that the electric potential between two points and L is that the distance between two points. The longer the wire the lesser the potential gradient and therefore the greater the sensitivity of the potentiometer.
To Learn more:
i)https://brainly.in/question/2765187
ii) https://brainly.in/question/1084104