Fabrication and Multidimensional Testing of a Spatial Micro Ampere Force Apparatus

This study presents a facilely fabricated spatial micro-Ampere-force apparatus, comprising two principal modules: an Ampere-force generation component and a lever-based measurement system. The Ampere force is a force arising from the interaction between an electric current and a magnetic field. A current-carrying parallelogram-shaped coil is subjected to Ampere force in an external steady magnetic field. The apparatus then amplifies the Ampere force via lever torque equilibrium. Moreover, the Ampere force can be quantitatively monitored in real-time with a high-precision electronic balance. In practical experiments, the vertical component of the Ampere force \(F_A\to\) that this device can measure can be expressed as NIBLcos\(\phi\)sin\(\theta\), and quantitative analyses have been conducted on these variable parameters. The measurement range of the apparatus is from 2.26x10-5 N to 1.40x10-2 N, coupled with a magnetic flux density sensitivity of 0.23 Gs. This instrument can be an effective pedagogical tool for electromagnetism education and a versatile experimental platform for characterizing Ampere forces, enabling multidimensional experimental exploration in secondary school physics laboratories.