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A proton follows a spiral path through a gas in a magnetic field of 0.010 T, perpendicular ot hte plane of the spiral. In two successive loops at points P and Q, the radii are 1.0 mm and 8.5 mm respectively. Calcualte hte hcnage in the kinetic energy of hte proton as it travels from P to Q/

I just need a general direction to go in and maybe what formulas to use. Since we are trying to find kinetic energy, would I be using the (mv)^2/r for centripetal force?

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# Homework Help: Magnetisim Problem! Just need an Equation.

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