普通物理實驗的創新－利用手機APP量測地球磁場

Innovation of General Physics Experiment - Measurement of Earth's Magnetic Field by a Mobile Phone

李欣(Shin Lee) ； 羅道正(Dau-Jeng Lwo) ； 江俊明(Chun-Ming Chiang)

《物理教育學刊》 18卷2期 (2017/12) Pp. 83-98

https://doi.org/10.6212/CPE.2017.1802.06

摘要

本文主要是利用手機的APP程式，來進行普通物理實驗-地球磁場量測實驗的改造。一開始我們製作亥姆霍茲線圈，我們利用此均勻磁場當作已知磁場來校正手機以增加準確性。接著將利用APP進行地球磁場的量測，進入磁場模式(Magnetic Field Mode)，量測到地球磁場大小與線圈中心磁場大小，將此數值經過校正係數處理後與理論值比較。最後我們可利用量得的實驗數值，利用圖形來進行空氣中的磁導率的計算。

關鍵字

APP ； 亥姆霍茲線圈

並列摘要

Free app applications are used to remodel a general physics experiment, the magnetic field of the Earth. The magnetic field sensor of a mobile phone was calibrated with a uniform magnetic field of the Helmholtz coil in the beginning. The magnetic field of the Earth and the circular current loops was measured. Experiment data was calibrated and processed in comparison with the theoretic values. Finally, the permeability of the air was calculated.

並列關鍵字

APP ； Helmholtz coil