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VNITS Question Series Consider the van der Waals interaction between two semi-infinite gold plates interacting across a vacuum. a. Compare the force per unit area as predicted by the Hamaker constant A= 2x10-19 J with the value of Casimir force, for values of plate separation of 1. 1 um 2. 100 nm 3. 1 nm b. At what separation hx are the two forces predicted to be equal? C. Which expression is more likely to be accurate for separations greater than hx and which is more accurate for separation less than hx? Give reasons for your answer in each case