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← ScienceWhich 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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