Youssef didn’t look up. His eyes were scanning a sea of vectors and Maxwell’s equations. “It’s not just electromagnetism, Mama. It’s the théorème d’Ampère . If I don’t understand the symmetry of the field, the whole problem collapses.”
Youssef looked at the . He wasn't afraid of the proton. He was afraid of Exercise 4 , the one with the charged particle in a crossed E and B field. The one where if you got the sign wrong, the particle flew into the void instead of forming a beautiful cycloid. Cours Physique Bac Math
Now, the exam was in six days.
He turned to the last empty page of the notebook. Above the printed formula for Énergie mécanique , he wrote one sentence in shaky handwriting: Youssef didn’t look up
Youssef looked at the diagram of the pendulum on the open page. Swinging back and forth. Uncertainty. Then equilibrium. It’s the théorème d’Ampère