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Which mechanism causes current to flow when voltage changes across an ideal capacitor?

A)Displacement current within the dielectric
B)Quantum tunneling of electrons
C)Ionic conduction due to impurities
D)Surface charge migration along plates

💡 Explanation

Capacitors pass alternating current through displacement current, because changing electric fields induce virtual conduction. This arises in the dielectric medium of the capacitor; therefore displacement current is the direct mechanism, rather than effects involving electron tunnelling.

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