The resistance of a wire of length 300m and cross-section area 1.0mm2 made of material of resistivity 1.0×10-7 Ωm is: a) 2Ω b) 3Ω c) 20Ω d) 30Ω
ScienceClass 10ICSEAnswered 27 Mar 2026
Answer
The correct option is d) 30Ω We know that
R = ρl/A
Substituting the values in the above equation we get 30Ω.