A parallel-plate capacitor is being charged by a battery through a resistor. If I is the conduction current in the external circuit, what exists in the gap between the capacitor plates?
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Question

A parallel-plate capacitor is being charged by a battery through a resistor. If I is the conduction current in the external circuit, what exists in the gap between the capacitor plates?

G1 Physics · Accepted Answer

Step 1: Charging produces time-varying electric flux between the plates. Step 2: Ampère–Maxwell law defines I𝒹 = ε₀ dΦᴇ/dt. Step 3: I𝒹 equals the external conduction current I in magnitude and joins it continuously in direction (option A). Final answer: (A) a displacement current of magnitude I in the same direction as the external current.