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While doing an experiment with potentiometer Fig. 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. (a) Which terminal + or -ve of the cell E_(1), is connected at X ub case (i) and how is E_(1) is related to E ? (b) Which terminal of the cell E_(1) is connected at X in case (ii) ? |
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Answer» Solution :In the given potentiometer experiment, the deflection in the galvanometer will be one sided if the emf of cell `E_(1)` is greater than the emf of battery `E` because than emf `E_(1)` is greater than fall of POTENTIAL across the potentiometer wire due to battery `E`. (a) The deflection in galvanometr will decrease while moving from one end `A` of the poteniomter wire to the end `B`, if POSITIVE of the cell `E_(1)` is is connected to `X` and negative of the cell to `Y`, because in this situation, the current in galvanometer decrease with the INCREASE in length of potentiometer wire. (b) The deflection in galvanometer will increase while moving from end `A` of the poteniomter wire to the end `B` if - ve of the cell `E_(1)` is connected to `X` and `+` ve to `Y`. In this situation, the current in galvanometer increases with the increase in the length of potentiometer wire. 
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