Force on two charged spheres in a 5000 N/C electric field

[KaneOris]

Heres the thing

Say i was to place 2 small charged spheres into and electric field which points downwards with a strength of 5000 $$N C^-1$$
Can anyone firgure out the force expirienced if the two charges were
+$$2*10^-6$$ and -$$5*10^-6$$?

 

[KaneOris]

This Latex thing doesn't work to well...

 

[Tide]

This belongs in the homework section.

And, yes, a lot of people can figure it out! The question is what have you tried so far?

 

[KaneOris]

Um, who said this was homework, practical expiriment perhaps?

 

[KaneOris]

Sorry, for sounding like that anyway...

I tried using $$\frac{F=k q_1 q_2}{r^2}$$

But without the distance i had no idea
and i also don't know how i should put the downwards force into the equation, should i use a vector?