电磁场是高中物理的重要内容之一,其中安培力扮演着一个非常重要的角色,特别是当一个导体受到的合外力仅为安培力时,根据动量定理可得ILBΔt=Δp ,设通过导体某一截面的电量为q ,则有q =IΔt,联立两式可得qLB =Δp .这一重要结论有着非常广泛的作用.现举几例加以说明.例1　如图 Electromagnetic field is one of the important contents of high school physics, in which Ampere force plays a very important role, especially when a conductor is subjected to an external force only Ampere force, according to the momentum theorem ILBΔt = Δp, set through a conductor The quantity of electricity in the cross section is q, then there is q = IΔt, and the important conclusion of qLB = Δp obtained by combining two equations has a very wide range of effects. Here are a few examples to illustrate. Example 1