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Faman39

  • 2 years ago

Describe the relationship between electricity and magnetism.

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  1. Faman39
    • 2 years ago
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    @blues can you able to help me with this?

  2. Devilonline
    • 2 years ago
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    A changing magnetic field induces electrical current in a wire and is the basis for electrical generation. Also an electrical current flowing through a wire creates a magnetic field and is the basis for most motors. In general a changing magnetic field creates an electrical field and a changing electrical field creates a magnetic field

  3. s3a
    • 2 years ago
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    Devilonline: Why is this relationship not perpetual?

  4. Devilonline
    • 2 years ago
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    It is perpetual...its never ending like if u dont disturb the magnetic field or electric current it wont stop like in motors and generators

  5. Mashy
    • 2 years ago
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    it is indeed perpetual.. and thats where james clerk maxwell comes into play.. he saw that they would keep on doing it. and hence he defined his electromagnetic waves!!

  6. s3a
    • 2 years ago
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    Devilonline, how does this not violate conservation of energy?

  7. Mashy
    • 2 years ago
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    Cause energy is not lost in the process!

  8. s3a
    • 2 years ago
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    I was implying that it was created. But, I'm assuming it's not so ... where is that additional energy obtained from?

  9. Mashy
    • 2 years ago
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    see initially some energy is required to create a disturbance.. infact.. in order to get an electromagnetic wave you need to accelerate charges (oscillating charges).. thats what happens when you switch on your bulb... the filament is heated to a high temperature... which causes the atoms to vibrate and they produce these electromagnetic waves.. so after a while the light diminishes right?..

  10. s3a
    • 2 years ago
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    If you mean as in the light bulb dying then, yes.

  11. Devilonline
    • 2 years ago
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    No as in becoming dull a bit

  12. Mashy
    • 2 years ago
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    exactly.. it dies off.. so the disturbance eventually dies off

  13. Devilonline
    • 2 years ago
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    No wait ur saying wen we turn on a bulb

  14. s3a
    • 2 years ago
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    Devilonline, are you talking to me or Mashy?

  15. Devilonline
    • 2 years ago
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    So then like it doesnt die off

  16. Devilonline
    • 2 years ago
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    Sorry i shud specify...mashy

  17. Mashy
    • 2 years ago
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    all waves.. eventually die off right??.. a ripple in water.. doesn't keep on going continuously.. theoretically it should.. but in reality it doesn't.. thats what I am saying!

  18. Devilonline
    • 2 years ago
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    So the light doesnt diminish the waves do no?

  19. s3a
    • 2 years ago
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    Ok, what about reality prevents that ripple from continuing? Other ripples that cancel the wave out, etc? So, about an engine, are you saying it would get more and more powerful infinitely if the engine never broke?

  20. s3a
    • 2 years ago
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    Without giving it more energy.

  21. Mashy
    • 2 years ago
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    the light DOES diminish... cause if you switch on teh bulb.. and you keep going farther and farther away.. the light becomes dull and finally at one point.. for all practical purposes you can't see the light at all!!

  22. Mashy
    • 2 years ago
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    @s3a.. i have no idea what you are saying? :P

  23. Devilonline
    • 2 years ago
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    Ooohhh!! I get it!! :D

  24. Devilonline
    • 2 years ago
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    S3a same here i dnt get what u r saying

  25. s3a
    • 2 years ago
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    Sorry lol. Two secs.

  26. s3a
    • 2 years ago
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    "It is perpetual...its never ending like if u dont disturb the magnetic field or electric current it wont stop like in motors and generators " This implies that if I give a motor some energy, I will never need to give it any more since it will (perpetually) make it on its own so the motor should go on forever until it breaks but, this doesn't seem to be the case with cards. You need to keep burning fuel (or whatever) to feed energy. So what am I missing? Also, sorry for being difficult to understand. I am presently tired but this topic striked my curiosity.

  27. s3a
    • 2 years ago
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    cars*

  28. Devilonline
    • 2 years ago
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    That the more electromagnetic energy u need more elcectricity and a stronger magnet u would need otherwise it would have the same magnitude of power...in cars u press the accelerator and it accelerates by getting more power from the battery

  29. Devilonline
    • 2 years ago
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    Like if u need a constant EMF source

  30. Mashy
    • 2 years ago
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    s3a.. you have friction.. if there was no friction.. then what you said is right!!

  31. s3a
    • 2 years ago
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    Mashy, friction with the car parts?

  32. Devilonline
    • 2 years ago
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    Oh yea eddy currents

  33. Devilonline
    • 2 years ago
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    No eddy currents....u know what they are??

  34. s3a
    • 2 years ago
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    I don't know what eddy currents are.

  35. s3a
    • 2 years ago
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    What I meant by "car parts" is basically "not tires".

  36. Devilonline
    • 2 years ago
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    Mashy the friction is cuz of the eddy currents right?

  37. Mashy
    • 2 years ago
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    i mean we live in a world comprised of friction.. thats why we need to put in more energy.. !! if there was no friction.. then a car once set into motion.. will keep moving until it hits something :P.. and friction inside car parts, friction between tyres and roads.. even if there was only friction INSIDE car parts.. but not outside.. then also.. once car set in motoin

  38. Devilonline
    • 2 years ago
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    Mashy also because of eddy currents

  39. s3a
    • 2 years ago
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    Mashy, I didn't understand what you said about if there was friction only INSIDE.

  40. s3a
    • 2 years ago
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    Ok so the bottom line is, energy can be created perpetually but it is lost to friction so the end result is you need to put more energy in manually?

  41. s3a
    • 2 years ago
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    Rather than relying on the "perpetual"ness.

  42. Mashy
    • 2 years ago
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    yea yea.. correct .

  43. s3a
    • 2 years ago
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    I think a better word would be "obtained" rather than "created". Would it?

  44. s3a
    • 2 years ago
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    For the energy.

  45. Devilonline
    • 2 years ago
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    Yesssss!!! I think i got confused about my concepts too by this question lol

  46. s3a
    • 2 years ago
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    Glad, I could do my part lol. :)

  47. Devilonline
    • 2 years ago
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    Wait which grade r u in s3a?

  48. s3a
    • 2 years ago
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    I already did my first electromagnetic course (before university). Right now, I'm going to 2nd year software engineering.

  49. s3a
    • 2 years ago
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    Non-university level by the way.

  50. s3a
    • 2 years ago
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    For the E&M course.

  51. Devilonline
    • 2 years ago
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    OMG and im explaining this to u lol no wonder i got confused by ur questions....ohbwait u did ur electromagnetic course but u dont know about eddy currents O.o

  52. s3a
    • 2 years ago
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    Maybe I just don't know them by name.

  53. s3a
    • 2 years ago
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    Did you learn that in the first year undergrad course (US system)?

  54. Devilonline
    • 2 years ago
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    Eddy currents (also called Foucault currents[1]) are electric currents induced within conductors by a changing magnetic field in the conductor. These circulating eddies of current have inductance and thus induce magnetic fields. These fields can cause repulsive, attractive,[2] propulsion, drag and heating effects. The stronger the applied magnetic field, or the greater the electrical conductivity of the conductor, or the faster the field changes, then the greater the currents that are developed and the greater the fields produced.

  55. Devilonline
    • 2 years ago
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    Nope olevels (cambridge system)

  56. s3a
    • 2 years ago
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    Well, I don't remember the stuff well and I need to review but is that like getting the intensity of the induced emf?

  57. s3a
    • 2 years ago
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    I don't know the UK system. Do you have a school before University and after High school?

  58. Devilonline
    • 2 years ago
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    What comes before senior year in highschool?

  59. s3a
    • 2 years ago
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    That just confused me more lol. In Canada, there is high school and then University but in Quebec there is high school --> CEGEP/College --> University

  60. s3a
    • 2 years ago
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    Do you have a middle school like that?

  61. s3a
    • 2 years ago
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    Again, I'm tired right now so sorry if I say stupid things.

  62. Devilonline
    • 2 years ago
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    No like ok ill make it simple im talking about the 11 and 12th grade

  63. s3a
    • 2 years ago
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    Well, I technically did it in 13th if I remember correctly and I did the waves course before instead of after.

  64. s3a
    • 2 years ago
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    waves, optics, modern physics

  65. Devilonline
    • 2 years ago
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    Oohk that makes sense now

  66. Devilonline
    • 2 years ago
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    Yea we do it in the 12th grade

  67. Devilonline
    • 2 years ago
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    Sorry i meant 11th

  68. s3a
    • 2 years ago
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    Oh, 11th I did kinematics, optics, stuff like that.

  69. s3a
    • 2 years ago
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    Anyways, this was nice but, I have to go fix a computer now so I'm going to go. Thank you both. @Devilonline and @Mashy

  70. Devilonline
    • 2 years ago
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    Lol nice working with u lol tc

  71. s3a
    • 2 years ago
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    You too. :) Bye.

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