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What Is the Magnetic Constant and Why Does It Matter?
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What Is the Magnetic Constant and Why Does It Matter?

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1 min read
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WIRED

This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to audio speakers. Oh, and without it we’d live in eternal darkness.

This means these three values can’t be independent; if you know two of them, you can derive the third. How do physicists deal with this? We define the speed of light as exactly 299,792,458 meters per second. (How do we know it’s exact? Because we def... [3715 chars]

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Source: WIRED

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