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  • While doing an experiment with potentiometer (Figure ) it was found that the deflection is one sided and (i) the deflection decreased while moving from one end A of the wire to the end B; (ii) the deflection increased.

While experimenting with a potentiometer (Figure ) it was found that the deflection is one-sided and (i) the deflection decreased while moving from one end A of the wire to the end B; (ii) the deflection increased. While the jockey was moved towards the end B.


(i) Which terminal + or –ve of the cellE_{1}, is connected at X in case (I), and how is E_{1} related to E?
(ii) Which terminal of the cell E_{1} is connected at X in case (ii)?

 

Answers (1)

1) As given in the problem, in case (i), the deflection decreases while moving from one end A of the wire to end B,

Thereby, decreasing the magnitude of current in the wire due to which potential difference across A and jockey decreases.

This shows deflection is one-sided. This is only possible if the positive terminal of the cell E1 is connected at X and E1>E.

Final Answer: The positive terminal of the cell E1 is connected at X and E1>E.

2) As given in the problem, in case (ii), the deflection increases while the jockey is moved towards the end of B. Then also deflection in the galvanometer is one-sided.

Thereby, the magnitude of current in the wire increases due to which potential difference across A and jockey increases.

This shows that the negative terminal of E1 is connected at X.

Final Answer: The negative terminal of E1 is connected at X.

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