如图a所示,一矩形线圈abcd放置在匀强磁场中,并绕过ab、cd中点的轴OO′以角速度ω逆时针匀速转动.若以线圈平面与磁场夹角θ=45°时(如图b)为计时起点,并规定当电流自a流向b时电流方向为
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![如图a所示,一矩形线圈abcd放置在匀强磁场中,并绕过ab、cd中点的轴OO′以角速度ω逆时针匀速转动.若以线圈平面与磁场夹角θ=45°时(如图b)为计时起点,并规定当电流自a流向b时电流方向为](/uploads/image/z/2429867-11-7.jpg?t=%E5%A6%82%E5%9B%BEa%E6%89%80%E7%A4%BA%2C%E4%B8%80%E7%9F%A9%E5%BD%A2%E7%BA%BF%E5%9C%88abcd%E6%94%BE%E7%BD%AE%E5%9C%A8%E5%8C%80%E5%BC%BA%E7%A3%81%E5%9C%BA%E4%B8%AD%2C%E5%B9%B6%E7%BB%95%E8%BF%87ab%E3%80%81cd%E4%B8%AD%E7%82%B9%E7%9A%84%E8%BD%B4OO%E2%80%B2%E4%BB%A5%E8%A7%92%E9%80%9F%E5%BA%A6%CF%89%E9%80%86%E6%97%B6%E9%92%88%E5%8C%80%E9%80%9F%E8%BD%AC%E5%8A%A8%EF%BC%8E%E8%8B%A5%E4%BB%A5%E7%BA%BF%E5%9C%88%E5%B9%B3%E9%9D%A2%E4%B8%8E%E7%A3%81%E5%9C%BA%E5%A4%B9%E8%A7%92%CE%B8%EF%BC%9D45%C2%B0%E6%97%B6%EF%BC%88%E5%A6%82%E5%9B%BEb%EF%BC%89%E4%B8%BA%E8%AE%A1%E6%97%B6%E8%B5%B7%E7%82%B9%2C%E5%B9%B6%E8%A7%84%E5%AE%9A%E5%BD%93%E7%94%B5%E6%B5%81%E8%87%AAa%E6%B5%81%E5%90%91b%E6%97%B6%E7%94%B5%E6%B5%81%E6%96%B9%E5%90%91%E4%B8%BA)
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