A wire of length 3 m and the area of cross section 1.7×10 to the power-6 m square has a resistance of 3×10 to the power-2 ohm. Calculate the resistivity of the wire
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R=ρl/A
R=resistance
ρ=resistivity
l=length
A=area of crossection
From the above formula,we get:
ρ=RA/l
R=3×10⁻² Ω
A=1.7×10⁻⁶ m²
l=3 m
ρ= (3×10⁻² ×1.7×10⁻⁶ )/3
=1.7×10⁻⁸ Ω⋅m
R=resistance
ρ=resistivity
l=length
A=area of crossection
From the above formula,we get:
ρ=RA/l
R=3×10⁻² Ω
A=1.7×10⁻⁶ m²
l=3 m
ρ= (3×10⁻² ×1.7×10⁻⁶ )/3
=1.7×10⁻⁸ Ω⋅m
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