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Relativistic angular moment of electron in electric field

  1. Jan 21, 2016 #1
    1. The problem statement, all variables and given/known data
    Consider an electron with spin ##\vec{S}## and magnetic moment ##\vec{\mu}=-\frac{e}{m}\vec{S}##. It is moving with the velocity ##\vec{v}(t)## relative to the inertial frame of reference ##I## through the electric field ##\vec{E}##. Calculate the angular momentum the electron experiences in its instantaneous rest frame ##I'##!
    Compute the angular momentum with respect to ##I## under the condition ##v\ll 1##!
    2. Relevant equations
    Lorentz Force: ##F^i=q F^{ik}u_k=q\gamma(\vec{E}\cdot\vec{v}, \vec{E}+\vec{v}\times\vec{B})##

    Where ##F_{ik}:=\partial_i A_k-\partial_k A_i## is the Faraday-Tensor

    and ##F^{ik}=\eta^{im}\eta^{kn}F_{mn}##

    The angular momentum tensor is given by ##l^{ik}=x^i p^k-x^kp^i##
    3. The attempt at a solution
    I really don't know how to solve this problem, sorry!
     
  2. jcsd
  3. Jan 25, 2016 #2

    Simon Bridge

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    Welcome to PF;
    Perhaps you need to reread your course notes so far ... and review your understanding of angular momentum?

    How would you normally find angular momentum?
     
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