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Relating an electric feild to a magnetic one.

TheDudeAbides
in Physics

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A Lithium ion with a mass of 1.16 x 10^-26 kg is accelerated through a potential difference of 220 V and than enters a magnetic field with magnitude 0.723 T perpindicular to the path of the ion. What is the radius of the ion's path in the magnetic field?

 

My gut is telling me that I need to find the speed as it enters the magnetic field, from there I could find the radius easily. But I can't find the speed. How to do this question?

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