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succubus

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An electrically neutral model airplane is flying in a horizontal circle in a 3m guideline, which is nearly parallel to the floor. The line breaks when the Kinetic energy is 50J. Now, reconsider the same situation, except now there is a point charge of +q and -q on either ends of the guideline. The line now breaks when the KE is 51.8 J. Find the magnitude of the charges.

I tried relating v2 = Fr/m, and equating that to v2=2(KE)/m so Fr/m = 2(deltaKE)/m and got a force of 1.2 N. I figure I have to find the force before I can find the point charge, but I can't seem to find the force. When I worked backward from the solution, the force turned out to be around 7x10(4) N. Which makes more sense. What am I doing wrong?

Thanks for any help