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Thread: Magnetism

  1. #1 Magnetism 
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    hey everyone, im kunz .. new in here .. id like to know a few things about magnetism .. here goes
    1. if i used two large magnetic discs and placed one on top of the other with like poles on same side i knw it wud repel each othe .. but wud it suspend the one on the top in the air ?? the reason im askin is tht i had seen a globe model which was suspended in the air using magnets ..

    2. if it does .. how big a magnet wud i need to achieve atleast aroun 3-4 inches gap between the two.

    3. if a wire through which electric current is passing is either touched to the plate or placed in between the two magnets, wud it force the magnets to generate an electromagnetic field.

    4. and if all dis is true .. cud i b able to achieve motion of the whole unit using any sort of device but no source of energy excpt the one tht exists in the magnets and around it ..

    dis is a very important experiment for me as it wud help me achieve somethin that no1 has thot of .. cud u plz help me wit it ..

    Thanks Alot in Advance..
    kunal!!


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  3. #2 Re: Magnetism 
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    Quote Originally Posted by canugetdjkunz
    hey everyone, im kunz .. new in here .. id like to know a few things about magnetism .. here goes
    1. if i used two large magnetic discs and placed one on top of the other with like poles on same side i knw it wud repel each othe .. but wud it suspend the one on the top in the air ?? the reason im askin is tht i had seen a globe model which was suspended in the air using magnets ..
    Probably they could; I'm not sure if magnets are that strong, but electromagnets certainly could.

    2. if it does .. how big a magnet wud i need to achieve atleast aroun 3-4 inches gap between the two.
    Don't know... maybe someone else can help.

    3. if a wire through which electric current is passing is either touched to the plate or placed in between the two magnets, wud it force the magnets to generate an electromagnetic field.
    Yes and no. Electromagnetism is generated when the wire moves across the magnetic fields. This would induce a little amount of electricity in the wire, but it would vanish as soon as the wire was still.

    4. and if all dis is true .. cud i b able to achieve motion of the whole unit using any sort of device but no source of energy excpt the one tht exists in the magnets and around it ..
    Nopi. You will always need some force that moves the wire across the magnetic fields. In the case of the simplier electromagnetic machines, like a dinamo like those on bikes, they spin a lot of wire rolled around a nucleus inside the magnetic fields of static magnets.

    As my teacher put it, "Electricity are electrons on the move, and they don't move without a reason..." :wink:


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  4. #3 Re: Magnetism 
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    hey thnx alot for ur help...
    reply to:
    1. well what do u mean by electromagnets .. i mean do u havto do anythin to the magnets to create electromagnetism or r der special type of magnets ??

    3. oh alrite .. so in tht case wud it b possible to create a solar battery operated circuit and attach it to the magnets wich wud help a constant circuit flow ?

    thnx alot for ur help .. realli appreciate it.
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  5. #4 Re: Magnetism 
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    Quote Originally Posted by canugetdjkunz
    hey thnx alot for ur help...
    reply to:
    1. well what do u mean by electromagnets .. i mean do u havto do anythin to the magnets to create electromagnetism or r der special type of magnets ??
    Houm..

    A electromagnet is a device which uses a vaiable electric current to create an also variable magnetic field.

    "Electromagnetism" refers to the interaction between electricity and magnetism, in which one sustains the toher... it's a bit like a playing leapfrog, where electricity leaps over magnetism and vice-versa.

    A electromagent uses an alternate current, whsoe "poles" shift ciclically, in order to create a magnetic field which will follow the pace of the electricity; whe the current raises, the magnetic field will weaken, and when the current goes down it raises the magnetic field. If they swap their roles fast enough, the resultign magnetical field wil be able to hold an object, and also the field will be as strong as the electricty is -the more power, the more magnetism.

    This is different to natural magnets, where all that happens is that the magnetic fields created by electrons orbiting the nucleus of the atoms are all aligned in a same direction and add one upon the next until they strengthen up enough to make a single coherent magnetic field. This only happens to some types of atoms, like iron or nickel.

    3. oh alrite .. so in tht case wud it b possible to create a solar battery operated circuit and attach it to the magnets wich wud help a constant circuit flow ?

    thnx alot for ur help .. realli appreciate it.
    Well, with a power supply (the solar cell) ti woud b epossible to create soem kind fo elecromagneitc circuit... the practicla problem would be to convert the direct current fot eh solar clel into alternate curent, as elecgromagnetism is created by AC; it is the shifting electricity what induces a shifting magnetism, and vice versa; when we move a wire through a magnetic field we're actualy shifting the strength of the field crossing the wire, and this is what causes some elecrons to "go astray" and be ready to move -this is what it's known as a "electrical charge", and then if we connect a place were there are stray elecrons with a place where electrons are missing, they will move from one to another and, presto!, we got electricity. :wink:
    “If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.” -Charles Darwin
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  6. #5  
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    wow ur a genius.. so ur sayin tht if i jack up the magnet wit a solar cell i cud force an electromagnetical field to b created if only i could find a way to convert DC into AC .. now my question is .. do u knw anyway i cud do tht ..
    thnx alot for ur help .. i reallie appreciate it....
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  7. #6  
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    if you had a magnet shaped like a satellite dish it would be easier because if the object veered a little it would correct it easier, or even better, a donut shape with a hole in the middle.
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  8. #7  
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    hmmm .. true .. but do u knw any way of convertin DC into AC while using a solar cell ??
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  9. #8  
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    The model T car used a spark gap generator. Basicly the electricity causes a magnetic charge when wrapped around somthing like a nail. The magnetic field in turn closed a contact which when closed shunted the current in the opposite direction which in turn creates AC.

    I hope that made sense...

    (just like the trick lighters which run off of very low ammounts of DC yet turns it to AC and shock the unsuspecting smoker... or a Stun gun. Both run off of DC but convert it to AC)
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  10. #9  
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    Quote Originally Posted by canugetdjkunz
    hmmm .. true .. but do u knw any way of convertin DC into AC while using a solar cell ??
    I don't see why a small alternator wouldn't work.
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