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Homework Statement
A doubly ionized atom (charge = +2e) whose mass is 5.15E-26 kg is accelerated by a voltage of 3450 V and enters a region where a uniform magnetic field B = 0.100 T acts perpendicular to its motion. What is the radius of curvature of the path of the ion in the B-field?
Homework Equations
r=\frac{mv}{qB}
e = 1.602 x 10-19
The Attempt at a Solution
Given the equation above this is a very simple problem except I don't know how to calculate the velocity of the ion from voltage. The only idea I had was conservation of energy: Kf = Ui or \frac{1}{2}mv2 = q\DeltaV. But this ended up wrong and in retrospect I'm not sure if it entirely makes sense to begin with...