Solution:
Radius of each circular plate is given as $0.06m$
Capacitance of a parallel plate capacitor is given as $\mathrm{C}=100 \mathrm{pF}=100 \times 10^{-12} \mathrm{~F}$
Supply voltage is given as $V=230 \mathrm{~V}$
Angular frequency is given as $\omega=300 \mathrm{rad} \mathrm{s}^{-1}$
(a) Rms value of conduction current is represented by the equation,
$I=\frac{V}{X_{c}}$
Where,
$X_{c}=$ Capacitive reactance $=\frac{1}{\omega C}$
$\therefore I=V \times \omega C$
$=230 \times 300 \times 100 \times 10^{-12}$
$=6.9 \times 10^{-6} \mathrm{~A}$
$=6.9 \mu \mathrm{A}$
As a result, $6.9 \mu \mathrm{A}$ is the rms value of conduction current.
(b) Yes, conduction current is equivalent to displacement current.