Brightness of the bulb increases on increasing the frequencyof a.c. source because with increase in frequency capacitive reactance Xc and consequently the impedance decreases.
Class 12 Physics Chapter 7 Alternating current Session 2024-2025.
A bulb and a capacitor are connectedin series to an a.c. source of variable frequency. How will the brightness of the bulb change on increasing the frequency of the a.c. source. Give reason.
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When a bulb and capacitor are connected in series to an A.C. source, increasing the frequency reduces the capacitive reactance X c, which decreases the circuit’s impedance. As a result, current increases, making the bulb’s brightness increase with frequency.
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