engineering physics MCQ #997

engineering physics MCQ #997

1. Question 1

   Q1. A wire of length 1 m has a resistance of 5 ohm. What is its resistivity if its cross-sectional area is 2 mm²?

   • A) 1 * 10⁻⁵ ohm*m
   • B) 1 * 10⁻⁶ ohm*m
   • C) 2 * 10⁻⁵ ohm*m
   • D) 2 * 10⁻⁶ ohm*m

   Answer: 1 * 10⁻⁵ ohm*m

   Explanation: R = ρL/A, rearranging gives ρ = RA/L = (5 * 2 * 10⁻⁶) / 1 = 1 * 10⁻⁵ ohm*m.