15.D【解析】根据左手定则可知bc边受到的安培力方向垂直于b边向下,故A项错误;ab边受到的安培力大小为F=BL故B项错误;三条边构成闭合的等边三角形,三边受到的安培力的合力为零,故ab边与b边受到的安培力的合力等于ac边受到的安培力,故C项错误,D项正确。
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