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UnkleRhaukus
Is electric current a scalar? Can it be negative?
THAT is what I thought also
i got it wrong, i dont really understand why
Current is scalar and it cannot be negative.
\[\LARGE I= - \frac{dQ}{dt}\] indicates that flow of current per unit time is decreasing maybe the question posted is a subpart of another question or perhaps incomplete.
the convention that we follow is movement of -ve charge as current right?
@DLS current can be negative
normally we don't take current as a vector and instead use the length vector instead.
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if i assume that way is +ve, then the reverse of it will be -ve. in a circuit we assume current directions initially. based on that we get -ve or +ve numbers after analysis
becoz current does'nt follow vector algebra so, it is scalar.
"the convention that we follow is movement of -ve charge as current right?" I think this is why. Current is created by flow of electrons which go from - to +, but current is defined as + to -.
Still, this site uses no negative sign, it has your answer... http://physics.tutorvista.com/electricity-and-magnetism/electric-current.html
maybe electric current is a phasor
Hmm, i guess current can be negative, because it does have direction (it can come up like that when using Kirchoff's laws, to find current in loops of a circuit).
http://openstudy.com/study#/updates/4fb98da9e4b05565342e8394 Look what phoneix_rags and chrsimmo have said.. hmm.. scalar i'd say now..
and why it is not a vector even though it has direction... i'll give it to ruchi.. still not 100% sure about what current is.. but scalar looks good to me.
ok another example.. for force on a current carrying wire in a magnetic field F=IdL×B .. here B is a vector.. and dL is a vector. we take the the direction of current to decide the direction of dL.. and it completely depends on what coordinate system we choose.