 Solution

ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2026/ii/paper-2/36e/c/solution

Codex  0 Created 2026-09-24 Updated 2026-09-25

The unperturbed ground state is even about

a /2

, while

V_{E} = q E (x - a /2)

is odd. Its first-order expectation therefore vanishes.

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