determine the resistence of a copper wire having a length of 1 km of diameter of 0.5mm
Answers
Explanation:
ρ= Resisivity of copper =1.7×10
−3
Ωm
convertung all measures into metres.
L=1km=1000m=10
3
m
d=0.5mm=0.5×10
−3
m
If r is the radius of the wire then, its area of cross-section
A=πr
2
∴A=π×(
2
d
)
2
=
4
π
(0.5×10
−3
)
2
m
2
R=ρ
A
L
=
0.2×10
−3
m
2
1.7×10
−3
Ωm×(10
3
m)
=85Ω
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Correct option is
Correct option isA
Correct option isA85
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωm
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.L=1km=1000m=103m
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.L=1km=1000m=103md=0.5mm=0.5×10−3m
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.L=1km=1000m=103md=0.5mm=0.5×10−3mIf r is the radius of the wire then, its area of cross-section
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.L=1km=1000m=103md=0.5mm=0.5×10−3mIf r is the radius of the wire then, its area of cross-sectionA=πr2
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.L=1km=1000m=103md=0.5mm=0.5×10−3mIf r is the radius of the wire then, its area of cross-sectionA=πr2∴A=π×(2d)2
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.L=1km=1000m=103md=0.5mm=0.5×10−3mIf r is the radius of the wire then, its area of cross-sectionA=πr2∴A=π×(2d)2=4π(0.5×10−3)2m2
Correct option isA85ρ= Resisivity of copper =1.7×10−3Ωmconvertung all measures into metres.L=1km=1000m=103md=0.5mm=0.5×10−3mIf r is the radius of the wire then, its area of cross-sectionA=πr2∴A=π×(2d)2=4π(0.5×10−3)2m2R=ρAL=0.2×10−3m21.7×10−3Ωm×(103m)=85Ω