A series R-C circuit is connected to an alternating voltage source. Consider two situations
a) When capacitor is air filled.
b) When capacitor is mica filled current through resistor is i and voltage across capacitor is V then

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$i_{a} = i_{b}$

$V_{a} > V_{b}$

$V_{a} = V_{b}$

$V_{a} < V_{b}$

answer is C.

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Detailed Solution

Capacitive reactance $X_{C} = \frac{1}{ωC} and C = \frac{ε_{r} ε_{0} A}{d}$

With the introduction of mica sheet capacitance will increase ( $ε_{r}$ times), and capacitive reactance decrease. which reduces the drop across the capacitor.

So, $V_{a} > V_{b}$

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