While doing an experiment with potentiometer (Fig.) it was found … - Vidyadip

Question

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 $B$.

Which terminal $+$ or $-ve$ of the cell $E_1,$ is connected at $X$ in case $(i)$ and how is $E_1$ related to $E$?
Which terminal of the cell $E_1$ is connected at $X$ in case $(ii)$?

✓

Answer

If the current in auxiliary circuit $($lower circuit containing primary cell$)$ decreases, and potential difference across $A$ and jockey/increases.
Then deflection in galvanometer is one sided and the deflection decreased, while moving from one end $'A\ '$ of the wire to the end $'S\ '.$
And clearly this is possible only when positive terminal of the cell $E_1$ is connected at $X$ and $E_1 > E$.
If the current in auxiliary circuit increases, and potential difference across $A$ and jockey $J$ increases.
Then also deflection in galvanometer is one sided.
And this is possible only when negative terminal of the cell $E_1 $ is connected at $X.$

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