Question

Find the resistance (in MΩ) of a wire of length 10 m, cross-sectional area 1 cm² and made of a material of resistivity 100 Ω-m. 

(a) 1000 

(b) 20

(c) 500

(d) 10

Answer 1

Correct option is (d) 10

Given, Length, l = 10 m

Area, A = 1 cm² = 1 x 10^-4 m²

Resistivity, ρ = 100Ω - m

As, we know that,