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【多选题】
如图所示,两根光滑的金属导轨,平行放置在倾角为θ的斜面上,导轨的左端接有电阻R,导轨自身的电阻可忽略不计.斜面处在一磁场中,磁场方向垂直于斜面向上.质量为m、电阻可以不计的金属棒ab,在沿着斜面与棒垂直的恒力F作用下沿导轨匀速上滑,并上升h高度,在这一过程中A.
作用于金属棒上的各个力的合力所做的功等于零
B.
作用于金属棒上的各个力的合力所做的功等于mgh与电阻R上产生的焦耳热之和
C.
恒力F与的合力所做的功等于零
D.
恒力F与重力的合力所做的功等于电阻R上产生的焦耳热
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