Electric Field of a Capacitor
A parallel-plate capacitor is made of two conductors separated by a thin insulating layer.
Between the plates, the field is strong, uniform, and perpendicular to the plates.
Positive electric charge on the top plate gets close as possible to the negative charge on the bottom plate.
Notes:
Most real capacitors have plates with very large area that are very close together.
The flow lines here look a little like the flow from a big, flat shower head over a great big, infinitely absorbent diaper.