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The study of magnetic fields in systems where the currents are steady (not changing with time). It is the magnetic analogue of electrostatics, where the charges are stationary.

4 votes
2 answers
59 views

Where does one more '$\rm m$' come from in the units?

$$\nabla \times A = B$$ $A$ is vector magnetic potential, $\mathrm{Wb/m}$ $B$ is magnetic field intensity, $\mathrm{Wb/m^2}$ Where does one more m come from for $B$? Is that from the gradient operator …
1 vote
3 answers
1k views

Why is the curl of magnetic field $0$ outside the conductor and non-zero inside? [duplicate]

I dont understand why the magnetic field does not curl outside the cable, according to this example, since I would expect the magnetic field lines to go back on themselves around the cable like shown …
2 votes
1 answer
67 views

Why isn't the magnetic field density zero here?

In my lecture notes for magnetostatics, my professor has this explanation of why H is not necessarily $0$ that I dont understand. …