$(a)$ When capacitor is air filled.
$(b)$ When capacitor is mica filled.
Current through resistor is $i$ and voltage across capacitor is $V$ then
$=$ Current in the circuit
$=\frac{V_{0}}{\sqrt{R^{2}+X_{C}^{2}}}=\frac{V_{0}}{\sqrt{R^{2}+(1 / \omega C)^{2}}}$
Voltage across capacitor, $V=i X_{C}$
$=\frac{V_{0}}{\sqrt{R^{2}+(1 / \omega C)^{2}}} \times \frac{1}{\omega C}=\frac{V_{0}}{\sqrt{R^{2} \omega^{2} C^{2}+1}}$
As ${C_a} < {C_b}$
$\therefore \,\,{i_a} < {i_b}$ and ${V_a} < {V_b}$
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