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At first glance an electric toothbrush seems like a simple bathroom tool. However, inside its slim waterproof casing hides a collection of physics principles that most people only encounter in textbooks. Every time it charges, vibrates and cleans your teeth, it puts electromagnetic induction, resonance and energy storage into action – quietly and seamlessly – without you ever having to think about it.
One of the most fascinating features is how it charges. Unlike most electronic devices, an electric toothbrush does not need exposed metal contacts or a plug-in cable. Instead, it uses electromagnetic induction.
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