Question

What should be emf of battery connected in main circuit for potentiometer?

Answer 1

Potentiometer is a very basic instrument used for comparing emf of two cells and for calibrating ammeter, voltmeter and watt-meter. Basic working principle of potentiometer is very simple. If we have connected two batteries head to head and tail to tail through a galvanometer, it means positive terminals of both batteries are connected together and negative terminals are also connected together through a galvanometer as shown in figure below:

In the figure, it is clear that if voltage of both battery cells is exactly equal, there will be no circulating current in circuit and hence galvanometer shows null deflection. Working principle of potentiometer depends on this phenomenon.
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Answer 2

Answer:

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