= Solution
For the same geometry, separation and intervening medium, the attractive <Van der Waals force> scales with the effective <Hamaker constant>. With the constants treated as applying to those same conditions,
$$
\boxed{\frac{|F_{\rm Ag}|}{|F_{\rm PS}|}=\frac{40}{6.6}\simeq6.06.}
$$
\b[The silver particles attract more strongly.] This comparison is conditional on a common geometry and on using the appropriate constants across the actual medium. Constants for particles in vacuum cannot automatically be applied unchanged across a solvent.
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