وفّر 50٪ من خلال الاشتراك السنوي في مجرة واحصل على تصفح لا محدود لأفضل محتوى عربي على الإنترنت.
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خاصية توجد بالقرب من المغناطيس، أو مجال كهربائي متغير، وتؤدي إلى جذب أو تنافر المغناطيسات الأخرى حوله، وللمجال المغناطيسي مقدار عددي واتجاه يشير إليه. وتُرسَم خطوط تخيلية للمجال المغناطيسي لمعرفة اتجاهه، ويُعبَّر عن مقداره بـ "B"، ويُقاس بوحدة "تسلا" التي سميت باسم العالم "نيكولا تسلا"، ويُعبَّر عنها بـ "T". وتتميز خطوط المجال المغناطيسي بكونها لا تتقاطع، وتشكل حلقات مغلقة دائماً. وللكرة الأرضية مجال مغناطيسي أيضاً، ينشأ نتيجة حركة الحديد الموجود في النواة الداخلية للأرض.
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