Question Detail
Question
A length of wire has resistance 10Ω. Resistance of same material, three times length, twice area?
Correct Answer
Option C is the correct answer.
Detailed Explanation
R = ρL/A. New R = ρ(3L)/(2A) = (3/2) × (ρL/A) = 1.5 × 10 = 15 Ω.
Hint
R ∝ L/A.