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- Thread starter jonno426
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So the ball has a charge but it isn't moving. Why would there be a magnetic force on it?

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To answer your question, yes you can determine the charge. First of all you should think about the sign of the charge. If the field is pointing down, and the resultant electric force opposes gravity, then what must the sign of the charge be? To find an actual number, you need to draw a free body diagram. You know that the only two forces acting on the ball are gravity and the electric force (what is the relationship between electric field and electric force?). Apply the fact that the ball is in static equilibrium, and you should be able to solve for the charge in terms of the field. If you know the field, then you can find a numerical answer as well.

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