1. The problem statement, all variables and given/known data A particle of mass m and charge q is subject to a uniform electrostatic eld ~E . (a) Write down the Hamiltonian of the particle in this system (Hint: consider the potential energy of an electric dipole); (b) Find the Heisenberg equation of motion for the expectation value of the position operator ~r, i.e. find the expression for d<r>/dt . (c) Find now an expression for d^2<r>/dt^2 (d) Rearrange the last expression to show that this is Newton's second law of motion. 2. Relevant equations 3. The attempt at a solution how to get the potential given the field - once the potential is known the hamiltonian can be solved. for part b, do we find [r,H] ??