What is displacement current ( i_d )? Considering the case of charging of a capacitor, show that i_d =ε_0 (d φ_E)/dt. What is the value of i_d for a…

What is displacement current $\displaystyle \left(\mathrm{i}_{\mathrm{d}}\right)$? Considering the case of charging of a capacitor, show that $\displaystyle \mathrm{i}_{\mathrm{d}}=\varepsilon_{0} \frac{\mathrm{~d} \phi_{\mathrm{E}}}{\mathrm{dt}}$. What is the value of $\displaystyle \mathrm{i}_{\mathrm{d}}$ for a conductor across which a constant voltage is applied?