The displacement current flows in the dielectric of a capacitor (A) becomes zero. (B) has assume

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The displacement current flows in the dielectric of a...

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Key Concepts

Displacement Current

Displacement current is a term introduced by Maxwell to extend Ampere’s law to situations involving time-varying electric fields. It represents the effect of a changing electric flux in a region where no physical charge movement occurs, allowing the continuity equation for current to be satisfied in systems like charging capacitors.

Capacitor Charging

During the charging of a capacitor, a time-varying electric field develops between its plates because the voltage across the capacitor changes over time. In a simple circuit with a constant conduction current leading to a linear increase in voltage, the displacement current in the dielectric becomes equal to the conduction current, keeping the overall current consistent in the circuit.

Dielectric in a Capacitor

The dielectric material in a capacitor is the insulating medium between its plates, which prevents direct conduction of charge. However, when the electric field across the dielectric changes, a displacement current is induced within the material. This current is not due to the movement of free charges but rather arises from the time-dependent polarization effects in the dielectric.

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