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您即將離開本站

並前往 https://www.khanacademy.org/science/in-in-class-12th-physics-india/moving-charges-and-magnetism/x51bd77206da864f3:biot-savart-law-magnetic-field-due-to-a-current-element/v/biot-savart-law-vector-form

是否確定要離開?