# physics

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What is the resistance of a 2.5 m length of copper wire 1.3 mm in diameter?

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Given by,
lenth (L)=2.5mm,Diameter of copper wire =1.3mm,R=?,A=?
A=S=PIE(D/2)squre

s=3.14*(1.3/2)square
=3.14x0.65x0.65 mm
=3.14x0.4225 mm
=1.32665 mm
A=1.32665mm

R=l/A
=2.5/1.32665
=1.9x10-2 ohm

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