engineering physics MCQ #941

The resistivity of a material is 1.7 * 10^-8 ohm-m. The resistance of a wire of length 1 m and area 1 mm² is?

engineering physics MCQ #941

  1. Question 1

    Q1. The resistivity of a material is 1.7 * 10^-8 ohm-m. The resistance of a wire of length 1 m and area 1 mm² is?

    • A) 1.7 * 10^-2 ohm
    • B) 1.7 ohm
    • C) 1.7 * 10² ohm
    • D) 1.7 * 10^-5 ohm

    Answer: 1.7 * 10^-2 ohm

    Explanation: R = ρl/A = (1.7 * 10^-8 ohm-m * 1 m) / (1 * 10^-6 m²) = 1.7 * 10^-2 ohm.