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图象解题具有直观、简单的功效,利用图象解题人们往往联想到图象的斜率、截距、坐标、面积、拐点等,而其他易被忽视.本文介绍应用图象解题的新亮点,将图形旋转、变换、展开,旨在探究图象解题的新颖性、灵活性,抛砖引玉.一、图形的旋转例1如图1,一质量为m,电量为+q的带电小球以v0的初速度射入水平的匀强磁场中,小球恰能在电场做直线运动.若电场的场强大小不变,方向改为相反,同时加一垂直纸面向外的匀强磁场,小球仍以原来的初速度重新射入,小球恰好也能做直线运动,求电场强度E及磁感应强度B的大小.
Image solving has an intuitive and simple function, the use of image problem solving is often associated with the image of the slope, intercept, coordinates, area, inflection point, etc., while others are easily overlooked. Highlights, the graphics rotation, transform, expand, designed to explore the novelty of image problems, flexibility, startling .A rotation of the graphics example 1 shown in Figure 1, a mass of m, the charge is + q charged balls The initial velocity of v0 into the horizontal uniform magnetic field, the ball can just do linear motion in the electric field.If the size of the electric field strength, the direction to the contrary, plus a vertical outward magnetic uniform field, Small ball is still re-entry of the initial rate of return, the ball can do a straight line just to find the electric field strength E and magnetic induction B size.