What force must be applied to detach two...

What force must be applied to detach two wetted photographic plates `(9 cm xx 12 cm)` in size from each other without shifting them. The thickness of water between the plates is 0.05 mm. Surface tension of water is 0.073 N/m.

`31.5 N`

`16.5 N`

`40.5 N`

`20.0 N`

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