What Is the Force Acting on a Charge in an Electric Field?

hoseA
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http://img90.imageshack.us/img90/358/electricforce8yv.png

I know how to do the first question. The second question is what's troubling me. I don't know where the forces are supposed to be directed (i.e. to which charge)... basically i don't understand what I'm finding out.

Any incite appreciated.
 
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There's a very simple relation that tells you the force acting on a charge placed in an electric field. What is it ?
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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