here given data,
resistance, R =0.0310 Ω
length lo wire, L= 6.20 m
diameter of wire , D = 1.85 mm
= 0.00185 m [ here 1 meter = 1000 mm,1.85/1000 = 0.00185 m ]
here area of wire ,
A = π D2 / 4
= 3.1428 * ( 0.00185 )2 /4
= 3.1428 * 0.0000034225 / 4
= 0.00001075623 / 4
A = 0.00000268905 m2
here , we have formula for resistivity,
ρ = RA/ L
= 0.0310 * 0.00000268905 / 6.20
= 0.0000001060975 / 6.20
ρ = 0.0000000171125 Ω m
ρ = 1.71125 × 10-8 Ω m
Here resistivity of wire is ρ = 1.71125 × 10-8 Ω m
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