高考物理解答题评分细则,往往只对主要解题方法(最基本的方法),给出详细评分标准,考生采用最常规的方法,比较容易拿到得分点。加之,老师阅卷速度比较快,采用最基本、最常规的方法有利于得分。例1.如图1,一半径为R的圆表示一柱形区域的横截面(纸面)。在柱形区域内加一方向垂直于纸面的匀强磁场,一质量为m、电荷量为q的粒子沿图中直线在圆上的a点射入柱形区域,在圆上 College entrance examination questions physical detail rules, often only the main problem-solving methods (the most basic method), gives detailed grading standards, candidates using the most common method, it is easier to get points. In addition, the teacher scored relatively fast, using the most basic and most conventional method is conducive to score. Example 1. As shown in Figure 1, a circle of radius R represents the cross-section (sheet) of a cylindrical area. In the columnar region plus a direction perpendicular to the paper uniform magnetic field, a mass m, the charge q is the particle along the line a point on the circle into the cylindrical area, on the circle