Answer:
Uniform
Directed from the negative to the positive plate
Step-by-step explanation:
The field inside a charged parallel-plate capacitor is __________.
• zero
• directed from the negative to the positive plate
• parallel to the plates
• uniform
A parallel plate capacitor is made of two opposite charged plates.
As a universal rule the electric field is directed from the negative charge to the positive charge. So in the capacitor the field is directed from the negative plate to the positive plate
Also the electric field inside the capacitor is constant irrespective of the location.

Where
is the surface charge density
is the permittivity of free space
is the relative permittivity of the material inside the plates