Abstract
In this article, we examine the rotation angle dependence of a hand-made fan-type variable capacitor for use in physics experiments in university classes. We made two circular bakelite plates, and the two terminal plates of the capacitor were 90° fan-type copper disks. The capacitance varied linearly with the rotation angle. The standard deviation from the linear fit was 1.4%, which was probably generated by the fact that the capacitor plates were not perfectly circular. Furthermore, we made a rotation angle sensing system using an AC high-pass filter. We selected the AC frequencies of 1 kHz and 100 Hz, which are easy to use in physics experiments. These experimental results also showed a linear relationship.
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