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A 10 nm particle of gold is “floating” in a vacuum below an infinite plane of...

A 10 nm particle of gold is “floating” in a vacuum below an infinite plane of silicon. At what separation distance between the particle and the plane does the van der waals FORCE become stronger than the force of gravity?

Science   Advanced-Physics   
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Answer #1

Vander wall's force,

for infinite plate, R2 is infinite,

so in limiting case,

substitue the value of A (Hamaker coefficient and you will get the ans)

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