Learn how to make the the simplest homopolar motor there is with just a regular battery, a small watch battery, and a formed copper wire. This is really as simple as a homopolar motor gets. Two batteries and some wire... that's it!
Apple's iOS 26 and iPadOS 26 updates are packed with new features, and you can try them before almost everyone else. First, check our list of supported iPhone and iPad models, then follow our step-by-step guide to install the iOS/iPadOS 26 beta — no paid developer account required.
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