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今年上海高考压轴题,立意新颖,它的最大的特色在于有效切割磁场的导体的长度是变化的,在设定电流不变的情况下,导体做的是非特殊的直线运动,也是非常见的加速度单调增加或减小的直线运动,因此第二问关于时间问题的求解成为关键,并对第三问的解答产生直接影响,本文对第二问求解给出另外三种思路,在情景探究中再给出第四种方法,并对金属棒运动情景、受力情况进行探究。
This year Shanghai college entrance examination pressure axis, innovative novel, its biggest feature is the effective length of the conductor cutting magnetic field is changing, the current set in the same circumstances, the conductor is a non-special linear motion, is also a very common acceleration Monotonically increasing or decreasing linear motion, so the second question on the issue of time to solve the key, and the third question has a direct impact on the answer, the second question to solve this article gives three other ideas in the scenario to explore and then Given the fourth method, and metal rod motion scenarios, stress conditions to explore.