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A capacitor and an inductance coil are connected in separate AC circuits with a bulb glowing in both the circuits. The bulb glows more brightly when
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a dielectric is introduced into the gap between the plates of the capacitor
Current, $\mathrm{i}=\frac{\mathrm{V}}{\sqrt{\mathrm{R}^{2}+\mathrm{X}_{\mathrm{C}}^{2}}}$
If a dielectric is introduced into the gap between the plates of capacitor. Its capacitance will increase and hence, impedance of the circuit will decrease. Thus, current and hence brightness of the bulb increase.
If a dielectric is introduced into the gap between the plates of capacitor. Its capacitance will increase and hence, impedance of the circuit will decrease. Thus, current and hence brightness of the bulb increase.
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