nathan12343 wrote:WakkaDojo is probably right, very often perturbations do not effect the energy to first order, but do effect the energy to second order.
That page also has a typo, dV = r^2sin(theta) dr dtheta dphi, not r^2sin^2(theta) dr dtheta dphi.
Correct, adding an external electric field modifies all sorts of things. But this is the first order correction in perturbation theory, which only rarely is an exact correction to the energy.
blackcat007 wrote:ok right i understand, but how do you get this eqn eErcos(theta)
Why are we assuming E along Z-axis only ?, It could be in any of ( x, y ) in cartesian or ( r ) in Cylindrical c--ordianate system.The question did not specify any direction right ?
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