Is it true that the more capacitors (two plates) are charged, the stronger the electric field will be?

Secondly, E=U/d,

So, E=Q/(C*d)

Where q is the amount of charge you said, d is the distance between the two plates, and c is the constant of capacitance, which can be ignored. According to this formula, it is easy to see that the stronger the electric field generated by the capacitor (two plates) is not only controlled by the amount of charge, but also affected by the distance between the two plates. When the distance is constant, the more the capacitor (two plates) is charged, the stronger the electric field is.