MDCAT Physics MCQ #466

The resistivity of a material is 1.68 × 10^−8 Ωm. What is the resistance of a 2m long wire with a cross-sectional area of 0.5 mm^2?

MDCAT Physics MCQ #466

  1. Question 1

    Q1. The resistivity of a material is 1.68 × 10^−8 Ωm. What is the resistance of a 2m long wire with a cross-sectional area of 0.5 mm^2?

    • A) 0.0672 ohms
    • B) 0.672 ohms
    • C) 6.72 ohms
    • D) 67.2 ohms

    Answer: 0.0672 ohms

    Explanation: R = ρL/A = (1.68 × 10^−8 × 2) / (0.5 × 10^−6) = 0.0672 ohms.