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物理
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有一无限长螺线管,单位长度上线圈的匝数为n,在管的中心放置一绕了N圈、半径为r的小线圈,其轴与螺线圈的轴线平行,设螺线管内电流变化率为dI/dt,求小线圈中的感应电动势.
人气:371 ℃ 时间:2020-04-15 21:36:28
解答
B = μ0 n I
Φm = NBS = Nμ0 n I π r^2
感应电动势大小:
ε = d Φm / dt =Nμ0 nπ r^2dI/dt
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