Physics, as a foundational science, significantly impactseveryday life and underpins most technological developments.1 Despite its importance, some students face challenges in studying physics due to its abstract content, such as matheatical equations, and the lack of accessible laboratory tools.2
The study by Arribas et al.3 demonstrated the practical use of smartphones equipped with magnetometer apps to measure how the magnetic field changes with distance, following an inverse cubic relationship. Ogawara et al.4 used a smartphone with a “zero-out mode” to eliminate surrounding magnetic fields, such as those from ferromagnetic materials and Earth’s magnetic field, and observed that the linear relationship between magnetic field and electric current aligned with Ampere’s law.
Here, we apply Ampere’s law to explore the connection between alternating current (AC) and magnetic fields of household appliances. Given that the average value of AC current is zero, the “zero-out mode” may interfere with the...
