Over and over I'm getting into the same trouble, so I'd like to ask for some...

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Physics

Over and over I'm getting into the same trouble, so I'd like toask for some help.
I need to solve some basic electrodynamics problem, involvingmagnetic fields, moving charges or currents.
But I forgot all this rules about \"where the magnetic fieldshould go if the current flows up\". I vaguely remember that itabout hands or fingers or books or guns, and magnetic field shouldgo somewhere along something, while current should flow alongsomething else... But it doesn't help, because I don't remember thedetails.
I do find some very nice rule and use it. And I think \"that oneI will never forget\".
...time passes...
Go to step 1.
The problem is that you have to remember one choice from adichotomy: \"this way or that way\". And all the mnemonics I knowhave the same problem -- I got to remember \"left hand or righthand\", \"this finger or that finger\", \"inside the book or outside ofthe book\".
Maybe someone knows some mnemonics, that do not have suchproblem?

Answer & Explanation Solved by verified expert

3.9 Ratings (791 Votes)

if the electric field is a vector with an arrow then the magnetic field is fundamentally not a vector instead it is an antisymmetric tensor with two indices determining an oriented See Answer

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