PHYSICS 30 - The Nature Of Matter

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I'm stuck on this question and I'm not sure where to start. :confused:

A positively charged ion (m = 3.34 x 10^-26 kg) was accelerated from rest through a potential difference of 1.66 x 10^4 V. This ion now enters a region where there is a magnetic field (B = 3.20 x 10^-2 T) that is perpendicular to the direction of its motion. If the magnetic force on the ion is 5.78 x 10^-15 N, what is the charge on the ion?

I've done this question many times, and it seems that there's on unknown I have to find first (I think the speed), but I can't get it for some reason. I also tried equating formulas....that worked, but I got the wrong answer afterwards.
 

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Galileo
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What is the increase in kinetic energy of a charged particle when it is accelerated through a potential difference V?
 

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