Physics - Current Electricity Question with Solution | TestHub
Two cells of e.m.f.s approximately V and V are to be compared using a potentiometer (sum and difference method) of length cm, then,
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Answer:
Solution:
In the sum and difference method using a potentiometer, the two cells are connected in series such that they assist each other in one case and oppose each other in the other.
The maximum e.m.f. to be balanced on the potentiometer wire is the sum of the e.m.f.s of the two cells, which is V.
For a balance point to be obtained on the potentiometer wire, the total potential difference across the entire length of the wire must be strictly greater than the maximum e.m.f. to be measured.
Therefore, the driver battery that runs the potentiometer must have a voltage of more than V.
Answer: a battery that runs the potentiometer should have a voltage of more than V.
