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UnkleRhaukus Group Title

Is electric current a scalar? Can it be negative?

  • one year ago
  • one year ago

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  1. .Sam. Group Title
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    THAT is what I thought also

    • one year ago
  2. UnkleRhaukus Group Title
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    i got it wrong, i dont really understand why

    • one year ago
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  3. .Sam. Group Title
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    Aw

    • one year ago
  4. DLS Group Title
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    Current is scalar and it cannot be negative.

    • one year ago
  5. DLS Group Title
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    \[\LARGE I= - \frac{dQ}{dt}\] indicates that flow of current per unit time is decreasing maybe the question posted is a subpart of another question or perhaps incomplete.

    • one year ago
  6. DLS Group Title
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    @yrelhan4 ? :O

    • one year ago
  7. yrelhan4 Group Title
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    the convention that we follow is movement of -ve charge as current right?

    • one year ago
  8. raane Group Title
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    @DLS current can be negative

    • one year ago
  9. Shadowys Group Title
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    normally we don't take current as a vector and instead use the length vector instead.

    • one year ago
  10. raane Group Title
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    because its scalar

    • one year ago
  11. ganeshie8 Group Title
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    |dw:1367418867689:dw|

    • one year ago
  12. ganeshie8 Group Title
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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

    • one year ago
  13. Ruchi. Group Title
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    becoz current does'nt follow vector algebra so, it is scalar.

    • one year ago
  14. agent0smith Group Title
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    "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 -.

    • one year ago
  15. agent0smith Group Title
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    Still, this site uses no negative sign, it has your answer... http://physics.tutorvista.com/electricity-and-magnetism/electric-current.html

    • one year ago
  16. UnkleRhaukus Group Title
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    maybe electric current is a phasor

    • one year ago
  17. agent0smith Group Title
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    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).

    • one year ago
  18. yrelhan4 Group Title
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    http://openstudy.com/study#/updates/4fb98da9e4b05565342e8394 Look what phoneix_rags and chrsimmo have said.. hmm.. scalar i'd say now..

    • one year ago
  19. yrelhan4 Group Title
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    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.

    • one year ago
  20. yrelhan4 Group Title
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    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.

    • one year ago
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