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JEE Main202329 Jan 2023Evening ShiftPhysicsCurrent ElectricityActual

With the help of potentiometer, we can determine the value of emf of a given cell. The sensitivity of the potentiometer is (A) directly proportional to the length of the potentiometer wire (B) directly proportional to the potential gradient of the wire (C) inversely proportional to the potential gradient of the wire (D) inversely proportional to the length of the potentiometer wire Choose the correct option for the a

Options

  1. AB and D only
  2. BA and C only
  3. CA only
  4. DC only

Correct answer

B. A and C only

Step-by-step solution

The basic principle of the potentiometer is that the potential drop across any section of the wire will be directly proportional to the length of the wire, provided the wire is of the uniform cross-sectional area and a uniform current flows through the wire. Therefore, sensitivity of potentiometer wire is inversely proportional to potential gradient. S e n s i t i v i t y ∝ 1 V l ∝ l V

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