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【单选题】
一条形磁铁静止在斜面上,固定在磁铁中心的竖直上方的水平导线中通有垂直纸面向里的恒定电流,如图所示。若将磁铁的 N极位置与S极位置对调后,仍放在斜面上 原来的位置,则磁铁对斜面的压力F和摩擦力厂的变化情况分别是A.
F增大， f 减小
B.
F减小，f增大
C.
F与 f 都增大
D.
F与f都减小
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【单选题】Sailcloth & More currently produces boat sails and is considering expanding its operations to include awnings for homes and travel trailers. The company owns land beside its current manufacturing faci...
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