engineering physics MCQ #984

The resistivity of a material is 1.7 × 10⁻⁸ ohm-m. The resistance of a wire of length 1 m and area of cross-section 1 mm² is?

engineering physics MCQ #984

  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 of cross-section 1 mm² is?

    • A) 1.7 × 10⁻² ohm
    • B) 1.7 × 10⁻⁵ ohm
    • C) 1.7 × 10⁻⁸ ohm
    • D) 1.7 ohm

    Answer: 1.7 × 10⁻² ohm

    Explanation: R = ρl / A = 1.7 × 10⁻⁸ × 1 / (1 × 10⁻⁶) = 1.7 × 10⁻² ohm.