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以匀强磁场为背景的命题在各类高考模拟试题中比比皆是,2015年上海高考试题一改这一命题背景,由匀强磁场变为直线电流磁场,但试题其他背景几乎相同,成为原始模型试题的衍生题,试题在平稳中创新,在创新中发展,成为2015年上海试题亮丽的风景。风景一:变换背景,变单解为双解原始模型1如图1所示,a、6是两根靠在一起的平行通电直导线,其中电流分别为I_A和I_B(已知I_A>I_B),电流方向如图,当给垂直于a、b所在平面加一个磁感应强度为B的匀强磁场时,导线a恰好
Uniform magnetic field as the background of the proposition in all kinds of college entrance examination simulation test abound, 2015 Shanghai college entrance examination questions to change this proposition background, uniform magnetic field into a linear current magnetic field, but the test background is almost the same as the other to become the original Model questions derived questions, questions in a smooth innovation, development in innovation, a 2015 Shanghai exam beautiful scenery. Landscape 1: Transforming the Background, Transforming the Solution into a Bivariate Solution to the Original Model As shown in Figure 1, a and 6 are two parallel energized straight conductors that come together, where currents are I_A and I_B, respectively (I_A> I_B is known) , The current direction shown in Figure, when the plane perpendicular to a, b plus a magnetic induction of B uniform magnetic field strength, the wire a just