14.B如图,金属杆ab的质量为m,长为L,通过的电流为I,处在磁感应强度为B的匀强磁场中,结果ab静止且紧压于水平导轨上.若磁场方向与导轨平面成θ角,求：(1)棒ab受到的摩擦力；(2)棒对导轨的压力.

14.B如图,金属杆ab的质量为m,长为L,通过的电流为I,处在磁感应强度为B的匀强磁场中,结果ab静止且紧压于水平导轨上.若磁场方向与导轨平面成θ角,求：(1)棒ab受到的摩擦力；(2)棒对导轨的压力.
14.B如图,金属杆ab的质量为m,长为L,通过的电流为I,处在磁感应强度为B的匀强磁场中,结果ab静止且紧压于水平导轨上.若磁场方向与导轨平面成θ角,求：
(1)棒ab受到的摩擦力；
(2)棒对导轨的压力.

14.B如图,金属杆ab的质量为m,长为L,通过的电流为I,处在磁感应强度为B的匀强磁场中,结果ab静止且紧压于水平导轨上.若磁场方向与导轨平面成θ角,求：(1)棒ab受到的摩擦力；(2)棒对导轨的压力.
安培力的大小为F=BIL 方向垂直磁场与导轨成90-θ度
其竖直分量为F1=BILcosθ
水平分量为F2=BILsinθ
棒ab受到的摩擦力f=F2
棒对导轨的压力.=导轨对棒支持力N
N=mg-F1=mg-BILcosθ

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