UnkleRhaukus
  • UnkleRhaukus
Is electric current a scalar? Can it be negative?
Physics
jamiebookeater
  • jamiebookeater
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.Sam.
  • .Sam.
THAT is what I thought also
UnkleRhaukus
  • UnkleRhaukus
i got it wrong, i dont really understand why
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.Sam.
  • .Sam.
Aw

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DLS
  • DLS
Current is scalar and it cannot be negative.
DLS
  • DLS
\[\LARGE I= - \frac{dQ}{dt}\] indicates that flow of current per unit time is decreasing maybe the question posted is a subpart of another question or perhaps incomplete.
DLS
  • DLS
yrelhan4
  • yrelhan4
the convention that we follow is movement of -ve charge as current right?
anonymous
  • anonymous
@DLS current can be negative
anonymous
  • anonymous
normally we don't take current as a vector and instead use the length vector instead.
anonymous
  • anonymous
because its scalar
ganeshie8
  • ganeshie8
|dw:1367418867689:dw|
ganeshie8
  • ganeshie8
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
anonymous
  • anonymous
becoz current does'nt follow vector algebra so, it is scalar.
agent0smith
  • agent0smith
"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 -.
agent0smith
  • agent0smith
Still, this site uses no negative sign, it has your answer... http://physics.tutorvista.com/electricity-and-magnetism/electric-current.html
UnkleRhaukus
  • UnkleRhaukus
maybe electric current is a phasor
agent0smith
  • agent0smith
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).
yrelhan4
  • yrelhan4
http://openstudy.com/study#/updates/4fb98da9e4b05565342e8394 Look what phoneix_rags and chrsimmo have said.. hmm.. scalar i'd say now..
yrelhan4
  • yrelhan4
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.
yrelhan4
  • yrelhan4
ok another example.. for force on a current carrying wire in a magnetic field F=IdL√óB .. 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.

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