3.7

נשתמש בביטוי האנרגיה האגורה בקבל:

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דרך נוספת: נחשב את האנרגיה האגורה בקבל כתלות במטען הקבל ובמתח בין הדקיו:

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דרך נוספת: נחשב את האנרגיה האגורה בקבל כתלות במטען הקבל ובקיבולו:

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