Question

The resistivity of a given wire of cross sectional area 0.7mm^2 is 4.9×10^-4ohms mm.Calculate the resistance of a 2ohms length of the wire

Answer 1

the resistance of the wire is 1.4 x 10⁻³ ohms.

Step-by-step explanation:

Given;

resistivity of the wire, ρ = 4.9 x 10⁻⁴ ohms.mm

cross sectional area of the wire, A = 0.7 mm²

length of wire, L = 2 mm

The resistance of the wire is calculated as follows;

`R = (\rho L)/(A) \\\\R = (4.9 * 10^(-4) * 2)/(0.7) \\\\R = 1.4* 10^(-3) \ ohms`

Therefore, the resistance of the wire is 1.4 x 10⁻³ ohms.