An electric lamp connected in series with capacitor and an ac source is glowing with certain brightness . How does the brightness of the lamp change on reducing the capacitance. Justify your answer. Share with your friends Share 9 Vara answered this Capacitive reactance:Xc=12πfCHere, f is frequency and C is capacitanceCapacitive reactance is inversely proportional to Capacitance.By decreasing the capacitance, the capacitive reactance increases.With increase in reactance, the current flow decreases.As the brightness depends on the magnitude of current, it can beconcluded that the brighness of the bulb decreases with decrease in current. 35 View Full Answer Utkarsh Singh answered this Decrease in capacitance would increase the capacitive reactance, which would thus increase the impedance. Hence current in circuit decreases and so does the brightness of the lamp. 12
