# The Naked Scientists Forum

### Author Topic: Electromagnetism The Binding Force Of Nature?  (Read 1634 times)

#### Voxx

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##### Electromagnetism The Binding Force Of Nature?
« on: 28/08/2012 16:27:45 »
Correct me if I'm wrong, but the binding force of atoms and subatomic particles is electromagnetism correct?

Also there are three types of charges in the subatomic levels, right?  Neutral, Negative, and Positive.

The world of subatomic particles is populated with mostly neutral charged particles and once they start receiving a charge and start binding together is the result of what we can see with our eyes?  Of course with the help of the electromagnetic spectrum of visible light and the particles absorbing those waves.

If one was to say neutralize the particles of say a desk where that binding factor is now neutral, would it just seem to vanish?

#### yor_on

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##### Re: Electromagnetism The Binding Force Of Nature?
« Reply #1 on: 28/08/2012 17:46:55 »

#### evan_au

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##### Re: Electromagnetism The Binding Force Of Nature?
« Reply #2 on: 30/08/2012 11:17:21 »
I would say that the force binding the negative electrons to the positive nucleus is the electromagnetic force ("opposite charges attract").

However, the nucleus consists of a number of positive protons and neutral neutrons in close proximity. If electromagnetism were the dominant force, the nucleus would instantly blow apart ("like charges repel"). However, the strong nuclear force is much stronger than electromagnetism at the short distances within a nucleus, and this holds the nucleus together.

Neutrons are electrically neutral, and don't respond to the electric force. However, they participate in the strong nuclear force. For the strong nuclear force to overcome the electric field, you need the same or slightly more neutrons than protons.
http://en.wikipedia.org/wiki/Stable_isotope

#### Voxx

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##### Re: Electromagnetism The Binding Force Of Nature?
« Reply #3 on: 06/09/2012 18:39:34 »
That's true, but isn't there also electromagnetic nuclear force?  Is that changeable by apposing charges?

#### imatfaal

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##### Re: Electromagnetism The Binding Force Of Nature?
« Reply #4 on: 07/09/2012 09:48:28 »
That's true, but isn't there also electromagnetic nuclear force?  Is that changeable by apposing charges?

The strong nuclear force is based on colour charge not electrical charge.  NB colour is just a name - we are talking about distance at which colour as a concept as a factor of vision has zero relevance - colour is just nomenclature, the pioneers could have called it Sven.  Colour charge is mediated by transfer of gluons - we have formalised this as a model called quantum chromodynamics (see the colour motif again).  The gluon acts as the charge carrier in QCD just as the photon acts as the charge carrier in quantum electrodynamics. QED is the quantum model that explains electromagnetic interaction.

As you can probably see there are real parallels between QCD and QED but there are huge differences (at day to day energy levels) between them. Two minor examples - there are three charge types in QCD (red green blue) and two in QED (positive and negative).   Secondly, we need and recognise free photons they are everyday light, radio waves, X-rays etc and the photon is not electrically charged so whilst it mediates the force is does not take part; conversely the gluon itself is colour charged and thus it both mediates the reaction and takes part itself.

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##### Re: Electromagnetism The Binding Force Of Nature?
« Reply #4 on: 07/09/2012 09:48:28 »