Question

Give a complete but brief explanation for the behavior of the current during the discharging of a capacitor in a circuit consisting of a capacitor and light bulb. Include detailed diagrams. Explain, don’t just describe.

Short answer

The bulb glows due to the high electron current and stops glowing due to the low electron current.

Step-by-step solution

Write the given data from the question.

The circuit is consisting a capacitor and light bulb in the series.

Determine the behaviour of the current after connecting the wires.

Consider the diagram that shows the charges in the instant of connecting the wires.

Initially, when the capacitor and bulb are connected with the wire, the bulb glows brightly due to the fringe electric field of the capacitor; the electric field is away from the positive charge and toward the negative charge. The electron current must be the same at all the wire locations. Therefore, the surface charge makes the electron current the same at every location because this surface charge travels from the positive terminal to the negative terminal.

the current after when bulb get dimmer.

The negative plates lose their negative charge because the electron moves away from the negative charge. When the plates have less charge on them, they contribute to the fringe electric field into connecting wires due to which the electric field gets smaller and current is also small which results to bulb glows less brightly.

When the capacitor has fewer charges on the plates, the electric field is also getting low, due to which the current becomes less, and the bulb glows dimmer, and when plates lose all their charges, the bulb stops glowing.