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Paul reports adjusting the frequency generator to around 5 kHz and increasing it to approximately 11 kHz to observe changes in the incandescent bulb's brightness. When fine-tuning around 458 kHz — the frequency producing optimal resonance — the bulb glows brightly, demonstrating effective voltage transfer with minimal current. Notably, when replacing the capacitor with a smaller value (e.g., 120 picofarads), the system still produces a glow, underscoring that resonance can be tuned within a pico farad range.
He emphasizes that the system's behavior indicates voltage transfer rather than traditional current flow, a nuance critical in resonance experiments.