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I see, thanks! Having thought about that, I've learned it this way: Combining electrical field strength, Efs = Voltage / distance and Efs = Force / charge Force . distance = Voltage . charge Work done by the particle accelerator = Voltage . charge The work done by the accelerator is...

I've taken a screen shot of the question [PLAIN]http://img803.imageshack.us/img803/753/73615252.png I know the answer (I've given it in the spoiler below), I don't understand why that is the answer Thanks if you can help :)