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      <title>9A21 - Tiết 26 - Bài 20.2: Hiệu ứng từ của 1 dòng điện by Nguyễn Thị Thu Hằng</title>
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      <pubDate>2021-11-16 00:59:38 UTC</pubDate>
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         <title>Hoạt động 1:</title>
         <author>vhangntt111</author>
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         <description><![CDATA[<div>1. Sưu tầm hình ảnh từ trường quanh dòng điện thẳng, tròn, ống dây có dòng điện chạy qua.&nbsp;<br><br></div><div>2. Điền từ vào chỗ trống:</div><div>Dòng điện đổi chiều thì chiều của đường sức từ …</div><div>Cường độ dòng điện càng lớn thì từ trường quanh dòng điện…<br><br></div><div>3. <strong><em>Khuyến khích</em></strong>: Nhận xét đặc điểm của từ trường xung quanh mỗi dòng điện.</div>]]></description>
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         <pubDate>2021-11-16 01:01:05 UTC</pubDate>
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         <title>Thư</title>
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         <title>Thư 2</title>
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         <pubDate>2021-11-19 06:49:03 UTC</pubDate>
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         <author>my025522</author>
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         <title>Khuê</title>
         <author>nguyenminhkhue1912</author>
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         <pubDate>2021-11-19 06:49:39 UTC</pubDate>
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         <title></title>
         <author>duy010938</author>
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         <title>San</title>
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