KCET2010PhysicsAlternating Current
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
Options
- Aan iron rod is introduced into the inductance coil
- Bthe number of turns in the inductance coil is increased
- Cseparation between the plates of the capacitor is increased
- Da dielectric is introduced into the gap between the plates of the capacitor
Correct answer
D. a dielectric is introduced into the gap between the plates of the capacitor
Step-by-step solution
Current, i = V 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.