MDCAT Physics MCQ #475

A potentiometer wire of length 4m has a resistance of 8 ohms. It is connected to a cell of emf 2V. What is the potential gradient?

MDCAT Physics MCQ #475

  1. Question 1

    Q1. A potentiometer wire of length 4m has a resistance of 8 ohms. It is connected to a cell of emf 2V. What is the potential gradient?

    • A) 0.25 V/m
    • B) 0.5 V/m
    • C) 1 V/m
    • D) 2 V/m

    Answer: 0.5 V/m

    Explanation: Potential gradient = V/L = (I*R)/L = (E/(R + r))*R/L, assuming r = 0, = E/L = 2/4 = 0.5 V/m.