barron 和 princeton輔導(dǎo)書 上的右手定則怎么和我知道的不一樣啊
我已經(jīng)快被搞瘋掉了
barron上說if the fingers of flat right hand point in the direction of the field,and the thumb is in the direction of electron flow,the hand will push in the direction of magnetic force
princeton的搞得我頭還要暈：point your thumb in the direction of V and your fingers in the direction of B.If q is postive,F points out of the palm.If q is negative,F points into the palm.
我就是不懂,我高中講的右手定則就是B V 和電流 怎么barron里又多了一個磁場力 princeton還要考慮正電荷還是負電荷