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this book from lecturer its contain about physics electro
Typology: Lecture notes
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FAKULTAS KEGURUAN DAN ILMU PENDIDIKAN UNIVERSITAS SEBELAS MARET (UNS) SURAKARTA
DR. Suharno, M.Si
1. Multipole Expansion of the Vector Potential Remember, the idea of a multipole expansion is to write the potential in the form of a power series in 1 𝑟 , where 𝑟 the distance to the point in question (Fig. 5.5 1), if r is sufficiently large, the series will be
Multipole Expansion of the Vector Potential…
Example: Multipole Expansion of the Vector Potential…
Example…
We have discussed two mechanisms that account for this magnetic polarization, (1) paramagnetism (the dipoles associated with the spins of unpaired electrons experience a torque tending to line them up parallel to the field) and (2) diamagnetism (the orbital speed of the electrons is altered in such a way as to change the orbital dipole moment in a direction opposite to the field). Whatever the cause, we describe the state of magnetic polarization by the vector quantity M = magnetic dipole moment per unit volume****. M is called the magnetization; it plays a role analogous to the polarization P in electrostatic.
Ampere's law in Magnetized Materials…
A long copper rod of radius 𝑅 carries a uniformly distributed (free) current 𝐼 (Fig. 6.19). Find 𝐻 inside and outside the rod!
Ans : 𝐻 = 𝜇 0 𝐼 2 𝜋𝑠
4 𝑧
