[الرواس]

سلام عليكم
عندي الكترون يهتز جيئة وذهابا حول مركز كرة مشحونة
باتساع مقداره اقل من r/2 (r هي نصف قطر الكرة)
كيف اثبت انه حركته هي حركة توافقية بسيطة؟

[myy]

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