a wire has radius 0.5 mm and length 62.8m. if the resistivity of the material of the wire is 5*10 raise to -7 find the resistance of the wire
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Given, Diameter=0.5mm,resistivity=1.6×10 −8
Ω−m,resistance=10Ω
we know that R=ρ A1
⇒1=ρRA
Where A is the area of the cross-section,
= 1.6×10 −8
10×3.14×( 20.000)
2=122.7m
Thus the length of the wire is 122.7m
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