MDCAT Physics MCQ #454

A wire of length 1 m and radius 0.01 m has a resistance of 10 ohm. What is its resistivity?

MDCAT Physics MCQ #454

  1. Question 1

    Q1. A wire of length 1 m and radius 0.01 m has a resistance of 10 ohm. What is its resistivity?

    • A) 3.14 x 10^-6 ohm-m
    • B) 1.57 x 10^-6 ohm-m
    • C) 6.28 x 10^-7 ohm-m
    • D) 3.14 x 10^-7 ohm-m

    Answer: 3.14 x 10^-6 ohm-m

    Explanation: Using the formula ρ = R(A/L) and A = πr^2, we get ρ = 10 * (3.14 * (0.01)^2) / 1 = 3.14 x 10^-6 ohm-m. Option B is incorrect due to miscalculation.