Question

Of what material is a wire made, if it is 20.0 m long with a 0.150 mm diameter and has a resistance of 18.0 Ω at 20.0°C?

Answer 1

Answer:

Silver (ρ=1.590431×10∧-8 Ωm )

Explanation:

Resistivity formula using diameter ρ = $\frac{\pi d^{2} R}{4L}$

Given: length(L)=20 m, diameter (d) =.150 mm=.150 ×10∧-3, Resistance (R)= 18 Ω

ρ = $\frac{\pi d^{2} R}{4L}$

= 0.01590431×10∧-6 Ωm

= 1.590431×10∧-8 Ohm meters (Electrical Resistivity of Silver at 20°C)