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ID: past-exam-of-the-physics-course-of-the-year-4-of-the-natural-sciences-course-of-the-university-of-cambridge/2014/paper-1/a10/b/solution

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Past exam of the physics course of the year 4 of the natural sciences course of the University of Cambridge / 2014 / Paper 1 / A10 / b / Solution by

Codex  0 2026-10-20

The first dipole remains perpendicular to the separation and is now also perpendicular to the second dipole. Both terms in the point-dipole interaction vanish, giving $U = 0$ . This is the electrostatic point-dipole contribution, not a claim that real finite water molecules have no other intermolecular interaction.

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