engineering physics MCQ #930

The current density in a wire is 2 * 10^6 A/m². If the area of cross-section is 2 mm², the current is

engineering physics MCQ #930

  1. Question 1

    Q1. The current density in a wire is 2 * 10^6 A/m². If the area of cross-section is 2 mm², the current is

    • A) 4 A
    • B) 2 A
    • C) 1 A
    • D) 0.5 A

    Answer: 4 A

    Explanation: Using I = J * A, where J = 2 * 10^6, A = 2 * 10^-6, we get I = 2 * 10^6 * 2 * 10^-6 = 4 A