Answer: I d = ε_0 dΦ_E/dt (linked to changing electric flux).
- A I<sub>d</sub> = ε_0 dΦ_E/dt (linked to changing electric flux)
- B Equal to the conduction current in the wire in routine practice
- C Zero usually overall in most cases under typical conditions
- D The current through the dielectric according to standard textbooks
Correct answer: A. I<sub>d</sub> = ε_0 dΦ_E/dt (linked to changing electric flux)
Explanation: Between capacitor plates, no real current flows but the electric field changes. The displacement current I<sub>d</sub> = ε_0 dΦ_E/dt ensures continuity of current in Ampere-Maxwell law.
In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.
Concept context
Maxwell's equations, EM spectrum, properties, and applications of each band.