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Magnetic flux

  1. Dec 13, 2015 #1
    1. The problem statement, all variables and given/known data
    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 ?



    2. Relevant equations
    QU = MV ^ 2 * 1 / r , then mv ^ 2 * 1 / r = QVB

    3. 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 cant be solved?
     
  2. jcsd
  3. Dec 13, 2015 #2
    I'm not sure what equation you are using here. What is U?

    You do not need Q to solve this question. You do, however, need v. This v would be the velocity of the negative ions after being accelerated by the voltage of 3kV, right before they enter the magnetic field. Can you find what is this v using the concept of energy?
    Show us your working
     
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