- Write the Hamiltonian for a particle in magnetic field \(\vec{B}(x)\).
- Compute the velocity operator \(\vec{v}= \frac{d \vec{r}}{d t}\) in the Heisenberg picture.
- Show that compute the commutator \( [v_x, v_y]\) and show that \[ [v_x, v_y] = \frac{ie\hbar}{m^c} B_z.\]
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4727:Diamond Point
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