MDCAT Physics MCQ #445

A cell of emf 1.5 V is connected to a 2 ohm resistor. If the current is 0.5 A, what is the internal resistance of the cell?

MDCAT Physics MCQ #445

  1. Question 1

    Q1. A cell of emf 1.5 V is connected to a 2 ohm resistor. If the current is 0.5 A, what is the internal resistance of the cell?

    • A) 0.5 ohm
    • B) 1 ohm
    • C) 1.5 ohm
    • D) 3 ohm

    Answer: 1 ohm

    Explanation: Using the formula I = E/(R + r), we get 0.5 = 1.5/(2 + r), so r = 1 ohm. Option A is incorrect because it miscalculates the internal resistance.