Question
You have a piece of copper with a volume of 2 cm3, and wish to form a wire having a resistance of
0.15 Ħ. How long should the wire be if the resistivity of copper is 1.72 ~ 10-8 Ħ. m?
0.15 Ħ. How long should the wire be if the resistivity of copper is 1.72 ~ 10-8 Ħ. m?
Answers
Elena
V=A•L
A=V/L
R=ρL/A = ρL²/V
L=sqrt{RV/ρ} =
=sqrt{ 0.15•2•10⁻⁶/1.72•10⁻⁸} = 4.17 m
A=V/L
R=ρL/A = ρL²/V
L=sqrt{RV/ρ} =
=sqrt{ 0.15•2•10⁻⁶/1.72•10⁻⁸} = 4.17 m