Question

Calculate the resistance of a wire of length 10cm cross sectional area 2.0 × 10^-8m^s and resistivity of 8.0 × 10^-7ohm meter

Answer 1

Answer:

Given :   R=2Ω            l=1 m            d=0.4 mm =0.0004 m

Cross section area of wire       A=4πd2=4π×(0.0004)2=1.256×10−7 m2 

Resistivity of the material       ρ=lRA

∴   ρ=12×1.256×10−7=2.514×10−7  Ωm

it may be wrong