A) an iron rod is introduced into the inductance coil
B) the number of turns in the inductance coil is increased
C) separation between the plates of the capacitor is increased
D) a dielectric is introduced into the gap between the plates of the capacitor
Correct Answer: D
Solution :
Current, \[i=\frac{V}{\sqrt{{{R}^{2}}+X_{C}^{2}}}\] 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.
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