ما فائدة عنصرا الساماريوم والكوبلت ؟

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تستخدم المغنطيسيات في المجاهر لأنها تساعد على بث الصوت . فإذا تم استخدام السامريوم والكوبلت فإنهما ينتجان مغنطيسيات قوية جدا .

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