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Two students $X$ and Y perform potentiometer experiment separately and null
point was obtained as shown in diagram. During the experiment,
(i) X increases the value of $\mathrm{R}$ (resistance)
(ii) Y decreases the value of S (resistance) without any other change
The position of null point obtained by students $\mathrm{X}$ and $\mathrm{Y}$ respectively
Options:
point was obtained as shown in diagram. During the experiment,
(i) X increases the value of $\mathrm{R}$ (resistance)
(ii) Y decreases the value of S (resistance) without any other change
The position of null point obtained by students $\mathrm{X}$ and $\mathrm{Y}$ respectively
Solution:
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Verified Answer
The correct answer is:
would shift towards point $B$, would shift towards $A$
(1) With $R$ increase, the current $I$ will decrease, so potential gradient will increase. So larger length will be required for a null point.
(2) When $S$ is decreased the current drawn from $E_{1}$ increases.
So $\mathrm{V}=\mathrm{E}_{1}-\mathrm{Ir}$, the potential difference across $\mathrm{E}_{1}$ will decrease. This new potential difference will be balanced by a smaller length of potentiometer wire.
(2) When $S$ is decreased the current drawn from $E_{1}$ increases.
So $\mathrm{V}=\mathrm{E}_{1}-\mathrm{Ir}$, the potential difference across $\mathrm{E}_{1}$ will decrease. This new potential difference will be balanced by a smaller length of potentiometer wire.
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