15. The magnitude of the electric field between the two circular parallel plates in the figure is E = (4.0 × 10⁵) - (6.0 x 10⁴t), with E in volts per meter and t in seconds. At t = 0, is upward. The plate area is 6.0 x 10^-2 m². For t≥ 0, what is the magnitude of the displacement current between the plates?

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