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Author Topic: Is a magnetic raincoat feasible?  (Read 7510 times)

Paul Anderson

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Is a magnetic raincoat feasible?
« on: 07/12/2009 10:30:03 »
Paul Anderson  asked the Naked Scientists:
   
Hi Chris and team,

I have just cleaned my coat and am thankful that cows cannot fly!

The other day as I was walking to work in the rain I was wondering about wearing a hat with a horizontal fan which knocked the rain drops away so I remained dry! I wouldn't be popular with passers by.

My next thought was about the charged particles which get caught in the earth's magnetic field and we get the Aurora Borealis. What about a magnetic field surrounding humans from head to feet, so the rain drops form an Aqua Borealis at our feet?

Now I suppose I shall face a barrage of responses saying that the speed of the rain drops descending would be greater than the strength of the magnetic field, or that the weight of the rain drops would negate any magnetic effect.

I am also waiting to see if someone saying the magnetic field would be detrimental to our health, and I welcome that rebuke, because that leads on to another query I have about maglev trains and whether regular commuters will be adversely affected by the magnetism, or does the magnetic field not extend as high as the carriage, but just as high as the bogies? I wonder if there is vertical dissipation of the magnetism through the bogies?
  
Regards
Paul
NZ

What do you think?


 

Offline chris

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Is a magnetic raincoat feasible?
« Reply #1 on: 09/12/2009 17:17:15 »
I don't think so! But you could develop an electrostatic raincoat; or perhaps carry around a giant comb that you continuously run through your hair to "charge up". Then you could bend the rain out of the way around you!

Chris
 

Offline LeeE

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Is a magnetic raincoat feasible?
« Reply #2 on: 09/12/2009 19:33:38 »
Do raindrops have a significant charge?

If they are to be deflected before they hit you then the point that the OP makes regarding overcoming the kinetic energy of the falling raindrop is valid.  I would be a bit concerned that the strength of the field you'd need to generate might make you a bit too attractive to lightning.
 

Offline RD

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Is a magnetic raincoat feasible?
« Reply #3 on: 10/12/2009 03:33:32 »
If the raincoat was charged, either positively or negatively, it would attract water ...
feature=player_embedded

A similar electrostatic principle is used to achieve an even coat when spray painting,
but the difference is the paint droplets are charged rather than the target...
http://en.wikipedia.org/wiki/Spray_painting#Electrostatic_spray_painting_.28Powder-coating.29


Water is diamagnetic and can be repelled by very strong magnetic field ...
NR=1

If you could make a ultra-magnetic raincoat/hat it would alter the flow of blood & lymph in your body,
 and if the wearer approached a steel lamppost they would be forcefully pulled towards it.
« Last Edit: 10/12/2009 03:38:50 by RD »
 

Offline Geezer

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Is a magnetic raincoat feasible?
« Reply #4 on: 10/12/2009 05:06:26 »
You could employ a laminar molecular force field on a deployable radial matrix.
 

Offline Atomic-S

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Is a magnetic raincoat feasible?
« Reply #5 on: 10/12/2009 05:22:22 »
To deflect raindrops by magnetic deflection would require that either they be charged to an unsustainable extent, or that the magnetic field be ridiculously intense.
 

Offline chris

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Is a magnetic raincoat feasible?
« Reply #6 on: 10/12/2009 08:45:52 »
Electrostatic spraying works slightly differently because you are exploiting two effects:

i) the paint leaving the gun is charged relative and opposite to the surface and so the paint particles are attracted towards the metal.

ii) the paint particles, carrying a like charge, mutually repel each other so that they remain separated and thus help to ensure an even paint film.

The comb and water trick (or the tissue paper and TV screen trick) does not involve any transfer of charge between the charged body (the comb) and the water stream; instead it is the redistribution of charged particles within the stream that causes the effect, which is subtly different.

Chris
 

Offline Madidus_Scientia

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Is a magnetic raincoat feasible?
« Reply #7 on: 10/12/2009 17:54:25 »
You could employ a laminar molecular force field on a deployable radial matrix.

You know you're a nerd when you get that joke :p
 

Offline Geezer

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Is a magnetic raincoat feasible?
« Reply #8 on: 10/12/2009 17:57:32 »
You could employ a laminar molecular force field on a deployable radial matrix.

You know you're a nerd when you get that joke :p

I wonder if anyone else got it!  ;D
 

Offline LeeE

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Is a magnetic raincoat feasible?
« Reply #9 on: 11/12/2009 01:25:50 »
You could employ a laminar molecular force field on a deployable radial matrix.

You know you're a nerd when you get that joke :p

I wonder if anyone else got it!  ;D

Ah yes - the old Mary Poppins flying machine.
 

Offline Geezer

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Is a magnetic raincoat feasible?
« Reply #10 on: 11/12/2009 18:14:44 »
Could we claim that any raincoat repels water by magnetic or electric means, at least at an atomic or molecular level?
 

Offline Madidus_Scientia

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Is a magnetic raincoat feasible?
« Reply #11 on: 11/12/2009 18:59:28 »
Yep
 

Offline johngreenspan

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Is a magnetic raincoat feasible?
« Reply #12 on: 18/12/2009 14:45:05 »
I really think you need an extraordinary amount of electrical charge in order to repel raindrops away from you before they hit your hair or skin... think you may need to carry a huge power generator around. lol.
 

Offline pjakesmith

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Is a magnetic raincoat feasible?
« Reply #13 on: 21/12/2009 06:49:18 »

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Is a magnetic raincoat feasible?
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