Question

Calculate the resistance of a wire of length 10cm and area of the cross-sectional area
2*10^-4 m^2 given the resistivity of the wire is 2.82^10-8 ohm meter
Identify wether the wire is a conductor tr an insulator

Answer 1

Answer:

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Answer 2

Answer:

given =  length (l) = 10cm

             area (a) =2 x 10⁻⁴

            resistivity = 2.82 X 10⁻⁸

To find = resistance =?

solution ,

apply the formula ,

R = ρl / A

R = 2.82 x 10⁻⁸ X 10 /  2 X 10⁻⁴

R  = 141 /10³ X 10⁻⁴

R = 1.41 X 10⁻⁶Ωm

so the resistance of the wire of length 10 cm is 1.41 X 10⁻⁶