MHT CET · Physics · Current Electricity
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
- A would shift towards \(A\) by both \(X\) and \(Y\)
- B would shift towards point A, would shift towards B
- C would shift towards \(B\) by both \(X\) and \(Y\)
- D would shift towards point \(B\), would shift towards \(A\)
Answer & Solution
Correct Answer
(D) would shift towards point \(B\), would shift towards \(A\)
Step-by-step Solution
Detailed explanation
(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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