A thin plate of uniform thickness is subject to pressure

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A thin plate of uniform thickness is subject to pressure as shown in the figure below

Under the assumption of plane stress, which one of the following is correct?

1. Normal stress is zero in the z-direction
2. Normal stress is tensile in the z-direction
3. Normal stress is compressive in the z - direction
4. Normal stress varies in the z-direction

Correct Option: A

For a plane stress criteria.
Normal stress in Z direction = 0.