Wednesday, September 24, 2014

electromagnetism - Why must the electron's electric dipole moment (EDM) always be aligned with the spin?


The electron has magnetic dipole moment which points in the spin direction, which is relatively easy to understand because it mostly follows from the definition. However, why is it that the (possibly non-zero) electron electric dipole moment (EDM) also has to be collinear with the spin? i.e. why must any possible internal polarisation of the electron have to align with spin?




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classical mechanics - Moment of a force about a given axis (Torque) - Scalar or vectorial?

I am studying Statics and saw that: The moment of a force about a given axis (or Torque) is defined by the equation: $M_X = (\vec r \times \...