Các thầy các cô các bạn các mod giúp em giải chi tiết với ạ nếu ai trả lời đúng trước 19h ngày 10/4/2020 thì em sẽ vote 5 sao cảm tạ Bài 4: Một khung dây cứng,phẳng diện tích 25cm vuông, gồm 10 vòng dây. Khung dây được đặt trong từ trường đều như hình vẽ. Cảm ứng từ biến thiên theo thời gian theo đồ thị: a.Tính độ biến thiên của từ thông qua khung dây kể từ lúc t = 0 đến t = 0,4s. b.Tìm chiều của dòng điện cảm ứng trong khung.

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