Three large but thin charged sheets are parallel to each

Question

Solve the all parts of following problem given bellow:

Problem: Three large but thin charged sheets are parallel to each other. Sheet I has a total surface charge density of 7.6nC/m², sheet II a charge of -1.8nC/m² , and sheet III a charge of 4.8nC/m2.

Part A: Estimate the magnitude of the force per unit area on sheet I, in N/m2? Find the direction of the force per unit area on sheet I, in N/m²?

Part B: Estimate the magnitude of the force per unit area on sheet II, in N/m2? Find the direction of the force per unit area on sheet II, in N/m²?

Part C: Estimate the magnitude of the force per unit area on sheet III, in N/m2? Find the direction of the force per unit area on sheet III, in N/m²?