Question

aluminium wire has radius 0.25 mm and length of 75 m. if the resistance of the wire is 10 ohms. calculate the resistivity of aluminum ​

Answer 1

Answer:

Resistance R = ρl/A, where ρ is the resistivity, l the length and A the area of cross section of the wire. ρ = RA/l = 10 x π x (0.25 x 10-3)2/75 ohm.m = 0.026 x 10-6 Ω m. = 2.6 x 10-8 Ω m.

Answer 2

Answer:

Resistance R = ρl/A, where ρ is the resistivity, l the length and A the area of cross section of the wire. ρ = RA/l    = 10 x π x (0.25 x 10-3)2/75 ohm.m    = 0.026 x 10-6 Ω m.    = 2.6 x 10-8 Ω m.

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