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The circuit diagram of a potentiometer f...

The circuit diagram of a potentiometer for determining the emf `epsilon` of a cell of negligible internal reistance.
(i) What is the purpose of using high resistance `R_(2)`? (ii) How does the position of balance point (J) change when the resistance `R_(1)` is increased ? (iii) Why cannot the point be obtained, (a) When the emf `epsilon` is greater than 2V, and (b) When the key K is closed.

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