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nhinguyen
2 năm trước
một khung dây hình tròn bán kính 25 cm đặt trong từ trường đều có vecto cảm ứng từ hợp vơi mặt phẳng khung dây góc 60 ,B =0,5T A) tính từ thông qua khung dây? B)trong khoảng thời gian 0,02s từ trường tăng từ 0,5 đến 2T tính suất điện động cảm ứng?
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