如图1所示,左侧的水平台面上固定着条形磁铁,图2固定着一螺线管

如图1所示,左侧的水平台面上固定着条形磁铁,图2固定着一螺线管.下列判断正确的是()

    A 螺线管内的磁场方向向左,磁铁受到的斥力向左

    B 螺线管内的磁场方向向左,磁铁受到的斥力向右

    C 螺线管内的磁场方向向右,磁铁受到的斥力向左

    D 螺线管内的磁场方向向右,磁铁受到的斥力向右

答案

考点  通电直导线和通电线圈周围磁场的方向.

分析:  由图可知电流方向,由右手螺旋定则可得出通电螺线管的磁极方向,则由磁极间的相互作用可得出磁铁受到的力.

解答:  解:由图可知,电流由左侧流入,则由右手螺旋定则可得,内部磁感线向左,螺线管左侧为N极;

因两磁铁为同名磁极相对,故磁铁受斥力方向向左;

故选A

点评:  本题考查右手螺旋定则的应用,属基础题型.

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