Talk:Magnetic induction: Difference between revisions
imported>Paul Wormer (New page: {{subpages}}) |
imported>John R. Brews (→Magnetic field B is a force?: new section) |
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== Magnetic field B is a force? == | |||
The intro says "The magnetic induction is commonly denoted by '''B'''('''r''',t) and is a vector field". That is a misstatement, as the ''force'' on a moving charge is the Lorentz force '''F''' = q ('''v × B''').[http://books.google.com/books?id=93E_vYuCKHYC&pg=PA277&dq=%22Lorentz+force%22+electromagnetism&hl=en&ei=ZNsATdC_JIrSsAPGmaiwCw&sa=X&oi=book_result&ct=result&resnum=5&sqi=2&ved=0CD4Q6AEwBA#v=onepage&q&f=false 1] | |||
From a microscopic standpoint, the magnetic field '''B''' is fundamental because it determines the effects upon the dynamics of the charges. The magnetic field intensity (or whatever you want to call it) '''H''' is a derived quantity '''H''' = '''B'''/μ<sub>0</sub> − '''M'''. The magnetization '''M''' is determined by decisions about the level of detail one needs in describing ensembles of charges, and so is really a decision about how coarsely one can deal with portions of a system of charges, lumping some of them together in an ensemble as a "magnetic material". [[User:John R. Brews|John R. Brews]] 13:48, 9 December 2010 (UTC) | |||
Revision as of 08:48, 9 December 2010
Magnetic field B is a force?
The intro says "The magnetic induction is commonly denoted by B(r,t) and is a vector field". That is a misstatement, as the force on a moving charge is the Lorentz force F = q (v × B).1
From a microscopic standpoint, the magnetic field B is fundamental because it determines the effects upon the dynamics of the charges. The magnetic field intensity (or whatever you want to call it) H is a derived quantity H = B/μ0 − M. The magnetization M is determined by decisions about the level of detail one needs in describing ensembles of charges, and so is really a decision about how coarsely one can deal with portions of a system of charges, lumping some of them together in an ensemble as a "magnetic material". John R. Brews 13:48, 9 December 2010 (UTC)