Verilenler: $L = 6.3\text{ m}$, çap $d = 2.4\text{ mm} \implies$ yarıçap $r = 1.2\text{ mm} = 1.2 \times 10^{-3}\text{ m}$, $V = 18\text{ mV} = 18 \times 10^{-3}\text{ V}$, $I = 750\text{ mA} = 0.75\text{ A}$.

Telin Kesit Alanı ($A$): $A = \pi r^2 = \pi \cdot (1.2 \times 10^{-3})^2 \approx 4.52 \times 10^{-6}\text{ m}^2$.
a) Özdirenç ($\rho$):
Direnç $R = \frac{V}{I} = \frac{18 \times 10^{-3}}{0.75} = 0.024\ \Omega$
$R = \rho \frac{L}{A} \implies 0.024 = \rho \cdot \frac{6.3}{4.52 \times 10^{-6}} \implies \mathbf{\rho \approx 1.72 \times 10^{-8}\ \Omega \cdot m}$ (Bakırın standart özdirenci).

b) Akım Yoğunluğu ($J$):
$J = \frac{I}{A} = \frac{0.75\text{ A}}{4.52 \times 10^{-6}\text{ m}^2} \approx \mathbf{1.66 \times 10^5\text{ A/m}^2}$

c) Elektrik Alan ($E$):
$E = \frac{V}{L} = \frac{18 \times 10^{-3}\text{ V}}{6.3\text{ m}} \approx \mathbf{2.86 \times 10^{-3}\text{ V/m}}$