Magnetic Boundary Conditions
 Calculating Magnetic Flux Density
To find the magnetic flux density at a point due to a current flowing in an infinitely long wire. This is useful because it gives us a simple equation to use on the next page where we determine Ampère's Law. Ampère's Law is required to find the boundary conditions for magnetic fields.
To find the total effect of the current at a point we need to find equations which will simplify the calculation. The most useful are the perpendicular distance between the wire and the point (a constant) and a relationship between the length of an element and the angle it makes with the point.
Combining the equations produces an integral with a simple solution.
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