cyrusabdollahi said:But a capacitor is NOT a complete path, there is a break in it! So even if BOTH ends are hooked up, there is no complete circuit is there?
The light bulb problem isn't a complete path either! If you want, connect a wire to the second terminal on the battery and bring it close to but not touching the other "connector" on the light bulb. It still won't light up even though you can consider the air between the connector to be a dielectric effectively making the system a capacitor!
You need potential difference to drive charge onto the capacitor plates.