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- The Biot-Savart Law is used to calculate the
- magnetic field at a given position. It is usually only
- practical to do the calculation in special cases where
- some symmetry makes the problem simpler. An
- example of these special cases includes the field
- created by an infinitely long straight wire. In this
- case, the magnetic field at a distance r from the
- wire is given by
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- where is the permeability constant
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