A variable frequency a.c source is connected to a capacitor. How will the displacement current change with a decrease in frequency?

Capacitive reaction is given as,

$\mathrm{Xc}=1 / 2 \mathrm{mf} \mathrm{C}$

As the frequency decreases, $X_ c$ rises, and the conduction current becomes inversely proportional to $X_ c$.