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MHT CET202020 Oct 2020Morning ShiftPhysicsCurrent ElectricityActual

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 R (resistance) (ii) Y decreases the value of S (resistance) without any other change The position of null point obtained by students X and Y respectively

Options

  1. Awould shift towards A by both X and Y
  2. Bwould shift towards point A, would shift towards B
  3. Cwould shift towards B by both X and Y
  4. Dwould shift towards point B , would shift towards A

Correct answer

D. would shift towards point B , would shift towards A

Step-by-step solution

(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 E₁ increases. So V = E ₁- Ir , the potential difference across E ₁ will decrease. This new potential difference will be balanced by a smaller length of potentiometer wire.

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