一载流导线穿过闭合回路L,现改变导线的位置,但不越出回路,则回路L上磁感应强度B的环流∮LB·dl
A.不变,L上各点的B不变
B.不变,L上各点的B改变
C.改变,L上各点的B不变
D.改变,L上各点的B改变
正确答案是B
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