Question

Calculate the resistivity of the material of a wire 10 m long,0.4 mm in diameter and having a resistance 2.0 ohm​

Answer 1

Explanation:

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Answer 2

Answer:

1.5 ×$10^{8}$ ohm m

Explanation:

Resistance (R) = 2.0 ohm

Length (L) = 10 m

Diameter (d) = 0.4 mm

Resistivity ( rho) = ?

Solution:

Radius (r) = d/2 = 0.2 mm = 0.0002 m

Area of crossection (A) = π$r^2$ = 1.25 ×$10^{-7}$ sq. m

Now, R = rho L/A

So, rho = RA/L = 2.0×10/1.25 ×$10^{-7}$ sq. m/ 10 m = 1.5 ×$10^{8}$ ohm m