A bacterium's built-in compass, explained: Single-cell magnetometry confirms Earth-field alignment

Some bacterial species possess an astonishing ability: They use Earth's magnetic field to orient themselves. To better ...
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Physics tutorial: Finding the current to deflect a compass needle

Learn how to find the current needed to deflect a compass needle in this step-by-step physics tutorial! Explore the principles of magnetic fields, current-carrying wires, and the interaction with a ...