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## Homework Statement

A particle of mass m and spin 1/2 is moving in an infinite, symmetric potential well

V (x) = { 0 -L<= x <= L.

= ∞ otherwise..

Under the effect of a weak external magnetic field.

B = -B k^ ; -L <= x <= 0

= -B i^ 0 <= x <= L.

where i^ and k^ are the unit vectors along the Ox and Oz directions. Calculate, in the first order of perturbation theory, the energy of the nth exited state of the partic

## The Attempt at a Solution

give me some hints to start this problem.