用手机做磁场实验
Magnetic Field Experiments Using a Phone
摘要：
为了使物理实验更直接地与日常生活相关，并帮助学生了解如何将智能手机或平板电脑用作科学测量的传感器，我们设计了两个介绍性物理实验来测量矢量磁场。这些实验最初是为在在线课程设置中远程工作的学生开发的。然而，这些实验也可以用于个人实验室活动。第一项活动使用手机的三维传感器来确定学生所在位置的背景磁场的矢量分量和方向。将得到的矢量磁场与预期的地球磁场进行比较，以确定它们的位置。第二个实验使用手机传感器来测量普通耳塞或入耳式耳机扬声器中的小磁铁产生的磁场。然后，学生们仔细研究了场的大小对扬声器磁铁和手机传感器之间轴向距离的依赖关系。使用环形磁体近似，引入先进的Excel曲线拟合方法来确定耳塞中磁体的半径以及磁体位置与耳塞外壳外表面之间的距离。
英文摘要：
To make physics experiments more directly relevant to everyday life and help students realize how their smart phones or tablets can be used as sensors for scientific measurements, we designed two introductory physics experiments to measure vector magnetic fields. These experiments were initially developed for students working remotely in an online course setting. However, the experiments can also be used for in-person laboratory activities. The first activity uses the phone's three-dimensional sensors to determine the vector components and orientation of the background magnetic field at the students' locations. The resulting vector magnetic field is compared to the expected Earth's magnetic field for their location. The second experiment uses the phone sensors to measure the magnet field produced by the small magnet found in the speaker of common earbuds, or in-ear headphones. The students then carefully investigate the dependence of the magnitude of the field on the axial distance between the speaker magnet and the phone's sensors. Using a ring magnet approximation, advanced Excel curve-fitting methods are introduced to determine the radius of the magnet in the earbud and the distance between the magnet's location and the external surface of the earbud housing.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
