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Vòng dây có diện tích 100 cm2 đặt trong từ trường đều B=0,1 T sao cho mặp phẳng khung vuông góc với B a) Xác định từ thông qua vòng dây b) quay khung 90 độ.Xác định từ thông qua vòng dây lúc này và độ biến thiên qua vòng dây
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