目的:医药类专业学生在学习医学物理的过程中在物理原理的理解上有一定困难,很难用物理原理解释各种临床现象,医学物理学的教学效果不明显.特别是在电磁感应章节中,对于洛伦兹力是否做功的问题上,学生很难理解,现有教材对此问题也往往避而不谈.本文以课外教学互动的方式开展了受洛伦兹力作用时电子运动轨迹的模拟演示,目的是发挥课堂知识的导向作用,提高学生的学习兴趣,发挥学生创新能力,扩展对物理原理的认知.方法:采用课外活动实践,带动学生共同建立模型,模拟并展示相关物理现象.结果:在课外实践活动中对物理现象的模拟中,学生深刻理解了洛伦兹力在电磁感应中的作用；由学生将模拟结果在课堂上演示,提高了全班学生学习的兴趣,教学效果明显提高;学生逐渐掌握自主分析、解决问题的能力.结论:很多医药类学生在毕业后会从事临床工作,在面对各种临床案例的时候,如果能够更快理解其中的物理原理,将会帮助他们更快处理各种疾病.在医学物理学教学过程中,根据学生的基础,多鼓励学生参与课外实践活动,可增强其对物理现象的理解,并帮助其在毕业后在临床岗位上更加熟练的处理工作中遇到的各种案例.课外实践仍然有很多工作需要开展,如吸引更多学生参与,构建更多物理模型,解释更多临床案例等.%Abjective: Pharmaceutical students have difficulties in the understanding of the physical principles in the process of learning medical physics; they always can not explain the clinical phenomenon by physical principles. The teaching of medical physics can not achieve the desired goals. In particular in the sections of the electromagnetic induction, students always do not understand whether the Lorentz force does work or not in the electromagnetic induction process and this problem is often avoided in the existing textbooks. In order to explain these problems, we encouraged teachers and students work together as a group in the after-school class for the study of the electron trajectory simulation when it is forced by Lorentz force. The purpose of the study is to play the guiding role of classroom knowledge, increase the students' interest in learning, help students to develop their innovation capability, expand the knowledge awareness of the physical principles. Methods: Extracurricular teaching practice was taken and the electron trajectories with Lorentz force were simulated by numerical method in conductors. The model of electrons in the conductors is given by teachers and the physical processes of electrons are simulated by the group. The simulation of physical process is based on the software Matlab. Results: First of all, in the process of extracurricular teaching practice, students who jointed in the group had a good understanding the function of Lorentz force in the electromagnetic induction. Secondly, the simulation results were shown in the class by the students, and increased the learning interests of the other students. The third, the students gradually obtained the ability to analyze and solve problemsindependently. Conclusions: Most of the pharmaceutical students will work in the clinical position after they graduate from school. The understanding of the physical principle of these clinical phenomenons especially the latest in clinical is important for the understanding and resolving these diseases. In medical physics teaching process, students have been encouraged to participate in extracurricular teaching practice which can increase the realization of physical phenomenon. This work is helpful for pharmaceutical students to solve the various clinical phenomenons more effective when they face a new case. There are still more job need to do in this extracurricular teaching practice: more students should joint the group, more physical models need to be set up and simulated in practice, and the latest clinical phenomenon which can be obtained in the hospital is helpful for the extracurricular teaching practice.
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