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Physics, 22.07.2021 09:10 celestemaria0727

Vòng dây mềm có bán kính 12cm đặt trong từ trường cường độ 0,15T. Vòng dây được nắm tại các điểm A và B và kéo dài cho đến khi diện tích của nó là gần như bằng không. Nếu phải mất 0,2s để đóng vòng dây, thì độ lớn của emf trung bình sinh ra trong vòng dây trong khoảng thời gian đó là bao nhiêu?

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