Maxwell Ampere law capacitor problem

[Amaelle]

Good day All!
I have an issue solving this question

According to my basic understanding, the displacement current goes from the positive plate to the negative plate, so whether the capacitor is charging or discharging the magnetic field direction should remain the same, but here is the the solution

I know that there is something missing in my understanding, so any help would be highly appreciated! thanks!

 

[collinsmark]

Good day All!
I have an issue solving this questionView attachment 219853

According to my basic understanding, the displacement current goes from the positive plate to the negative plate, so whether the capacitor is charging or discharging the magnetic field direction should remain the same, but here is the the solutionView attachment 219854
I know that there is something missing in my understanding, so any help would be highly appreciated! thanks!

I don't think you are correct when you say, "[...] the displacement current goes from the positive plate to the negative plate, so whether the capacitor is charging or discharging the magnetic field direction should remain the same [...]."

The direction of the displacement current can change depending on whether the capacitor is charging (Q increasing) or discharging (Q decreasing).

[Hint: the displacement current in this example is zero when the real current is zero (when Q is not changing).]

 

[Amaelle]

Thanks a million, the direction of the displacement current is that of the variation of the Electric field , is that case, the current goes up means that E is increasing means that the capacitor is charging!