02-16-2017, 03:14 PM 
	
	
	
		The interaction energy between two spherical particles is plotted against the distance ® between them. When r<a where 'a' is constant, the net force between the spherical particles is repulsive. When r≥a, they attract via van der Waals attractions. Which one of the following plots correctly represents the interaction energy between the above two particles?
   
	
	
	
	


![[+]](https://www.biotechnologyforums.com/images/netpen-pro/collapse_collapsed.png)