下列关于磁感应强度大小的说法中,正确的是 (    )A.通电导线

下列关于磁感应强度大小的说法中,正确的是 (    )

A.通电导线受磁场力大的地方磁感应强度一定大

B.通电导线在磁感应强度大的地方受力一定大

C.放在匀强磁场中各处的通电导线,受力大小和方向处处相同

D.磁感应强度的大小和方向跟放在磁场中的通电导线受力的大小和方向无关

答案

D

解析:因为磁场中某点的磁感应强度的大小和方向由磁场本身决定,与通电导线的受力及方向都无关.

    因为通电导线在磁场中受力的大小不仅与磁感应强度有关,而且与通电导线的取向有关,对于匀强磁场中磁感应强度处处相等,但当导线在各个位置的方向不同时,磁场力是不相同的(导线与磁场垂直时受磁场力最大,与磁场平行时受磁场力为零),而C选项中没有说明导线在各个位置的取向是否相同.

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