Delete cheatsheet.en.md

01.curriculum/01.physics-chemistry-biology/04.Niv4/04.electromagnetism/01.maxwell-equations/02.maxwell-equations-overview/cheatsheet.en.md

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-text : "The 4 Maxwell's equations"
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-![](Maxwell-equation-en.jpg)
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-![](general-scheme-electromagnetism-vacuum-2-L1200.jpg)