I'm working on a game which involves streams of electrically-charged particles, being manipulated with electric and magnetic fields. Since I want a large number of small objects coming from an emitter and lasting a limited amount of time, a particle system seems like the way to go.
My only problem now is: how to apply the force? Suppose, for example, I have a charged object somewhere in the scene; I want to apply a force toward it, varying with the radius squared. If my particles were Rigidbodies, applying this force in the FixedUpdate would be easy; is there a way to do the same to an individual particle?