选择题:[简答题,10分] 设穿过线圈中的磁通Φ随时间作梯形变化,如图所示。试问线圈中的感应电动势随时间如何

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[简答题,10分] 设穿过线圈中的磁通Φ随时间作梯形变化,如图所示。试问线圈中的感应电动势随时间如何变化
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