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Mastering physics help - rail gun

  1. Sep 2, 2010 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations

    3. The attempt at a solution
    I think i need to use energy methods for this because the acceleration is not constant..
    trouble is I don't know the formula for the potential energy in cases like this.

    Thanks for any help.

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  2. jcsd
  3. Sep 2, 2010 #2


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    What's the force on a current-carrying wire in a magnetic field? (There is a formula for it.)
  4. Sep 2, 2010 #3
    F=BIL thats how i found the acceleration.. but i dont see how that helps with b??
  5. Sep 2, 2010 #4
    how was this current produced in the first place? What kind of current are you dealing with?
  6. Sep 2, 2010 #5
    I dont know what you mean???? it was supplied by a cap if that helps?
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