| Magnetic Field and Currents |
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| Empirically, we know that moving charges produce a magnetic field.
We also |
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| know that the field B is perpendicular to the direction of current
flow and |
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| the vector connecting the current source and the location at which
we want |
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| to know the field. We also know that the field falls off like 1/r2. These |
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| lead
to the Biot-Savart Law, the magnetic equivalent of Coulomb’s Law. |
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