The conduction current in ideal case through a circuit is zero when charge on capacitor is

Options

A. zero
B. maximum
C. any transient value
D. depends on capacitor used

Explanation

To solve the question "The conduction current in ideal case through a circuit is zero when charge on capacitor is...", we need to analyze the behavior of a capacitor in a circuit.

### Step-by-Step Solution:

1. **Understanding the Capacitor**: A capacitor is a device that stores electrical energy in an electric field. It consists of two conductive plates separated by an insulating material (dielectric). When connected to a battery, charge accumulates on the plates.

2. **Current in the Circuit**: The conduction current (I) in the circuit is defined as the rate of flow of charge (dq/dt). This means that current is present when there is a movement of charge.

3. **Charging Phase**: When a capacitor is initially connected to a battery, it starts charging. During this phase, charge flows from the battery to the capacitor, and thus there is a conduction current in the circuit.

4. **Fully Charged Capacitor**: As the capacitor charges, the voltage across its plates increases. The charging continues until the voltage across the capacitor equals the voltage of the battery. At this point, the capacitor is fully charged.

5. **Current at Full Charge**: When the capacitor reaches its maximum charge, it no longer draws any current from the battery. This is because the potential difference across the capacitor plates matches the potential difference of the battery, resulting in no net movement of charge.

6. **Conclusion**: Therefore, when the capacitor is fully charged, the conduction current in the circuit becomes zero. This means that the conduction current is zero when the charge on the capacitor is at its maximum.

### Final Answer:
The conduction current in an ideal case through a circuit is zero when the charge on the capacitor is at its maximum.

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