A 10cm x 10cm parallel-plate capacitor has 30 mm spacing

Question

Solve each part of given problem:

Problem: A 1.0cm x 1.0cm parallel-plate capacitor has 3.0 mm spacing. The electric field strength inside the capacitor is 1.4x10⁵ V/m.

Part I: What is the potential difference across the capacitor?

Part II: How much charge is on each plate? q1, q2

I have been stuck on this problem for a long time, please help. Show steps. Thank you!