单选题楞次定律是用来确定（）。A磁通的方向B线圈中感应电动势的方向C直导体中感应电动势的方向D磁场的方向
单选题
楞次定律是用来确定（）。
A
磁通的方向
B
线圈中感应电动势的方向
C
直导体中感应电动势的方向
D
磁场的方向
参考解析
解析：
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