The name is absent



Fig. 5 Direction ofthe lines of the magnetic induction around axis with current (a)
and along the axis of contour with current (b). The current i by convention
denotes the flux ofpositive charges.


The united electromagnetic field manifests itself with resultant electromagnetic
force FR defined by the Coulomb-Lorentz formula:

(29)


——              ——                ——

FR=q(E+vi×B)


where ι/i is the velocity of the charge q.

(30)


——
vi


dl dq ■ dl i ■ dl


dt dt ■ dq dq


If we have magnetically isotropic media then we could define another vector
describing the magnetic field called magnetic intensity H that is:

——

(31)


Hi = B

μ

where μ is the magnetic permeability of the media. The magnetic permeability of
the vacuum is denoted with μ0 ≈ 4π × 10-7 H/m.

24



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