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Homework Help: Velocity(t), of rod moving in B-field

  1. Mar 12, 2013 #1
    Here's the question



    Here's my attempt using energy approach.


    However, i'm kinda stuck. how do I solve this DE to get the expression for v(t)?
  2. jcsd
  3. Mar 12, 2013 #2


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    I think it will be much simpler to just apply Newton's second law: ##F = ma = m\dot{v}##

    [You could take the derivative with repsect to t of both sides of your last equation and get a differential equation for v(t), but it will be the same as just setting up F = ma.]
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