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tankarish
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Homework Statement
A magnet is used to control negative ions and only allow those with a specific mass to pass through a narrow gap opening . The magnet will bend the ion beam in a quarter circle of radius 50 cm .
In an experiment, a negative ion accelerated by a voltage of 3.0 kV.
Which magnetic flux density must the magnets have for these molecules with mass 277 u to follow the circular path through the magnet and get through the gap opening ?
Homework Equations
QU = MV ^ 2 * 1 / r , then mv ^ 2 * 1 / r = QVB
The Attempt at a Solution
Because we have volt , I think QU = MV ^ 2 * 1 / r , then mv ^ 2 * 1 / r = QVB
But we do not have Q, or v. Thus I do not know how I solve this .
Sorry for the English, but it seems the problem can't be solved?