## Magnetic Sources

The Biot-Savart Law

k

_{m}is the "magnetic constant" just as k = 9 x 10^{9}Nm^{2}/C^{2}was the proportionality constant in Coulomb's Law. The Biot-Savart Law for magnetism is somewhat comparable to Coulomb's Law for electricity. Notice its inverse-square dependence -- similar to Coulomb's Law (and Newton's Law of Universal Gravitation). This constant k_{m}is just a proportionality constant that is determined by the units we use. However, it is related to other constants,The Biot-Savart Law gives the magnetic field due to a small current element. To find the full or complete or total magnetic field, we must integrate that small current element over the entire current;

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