eddie99
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| posted on 17/6/10 at 08:57 PM |
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Calling Physics Guru's - Lenz's law and eddy currents
Hi Guys,
Have one of my physics exams tomorrow and i still don't quite get lens's law and eddy currents, anyone have a dummy explanation or a good
way of explaining them.
Thanks
Ed
http://www.elitemotorsporteng.co.uk/
Twitter: @Elitemotoreng
Facebook: http://www.facebook.com/pages/Elite-Motorsport-Engineering/153409081394323
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v8kid
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| posted on 17/6/10 at 09:05 PM |
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Never heard of it! Are you referring to Flemings right and left hand rules?
These continentals - always pinching our ideas!!
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eddie99
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| posted on 17/6/10 at 09:06 PM |
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Im talking about:
http://en.wikipedia.org/wiki/Lenz's_law
http://en.wikipedia.org/wiki/Eddy_current
http://www.elitemotorsporteng.co.uk/
Twitter: @Elitemotoreng
Facebook: http://www.facebook.com/pages/Elite-Motorsport-Engineering/153409081394323
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austin man
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| posted on 17/6/10 at 09:11 PM |
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http://micro.magnet.fsu.edu/electromag/java/lenzlaw/
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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austin man
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| posted on 17/6/10 at 09:11 PM |
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http://micro.magnet.fsu.edu/electromag/java/lenzlaw/
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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v8kid
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| posted on 17/6/10 at 09:11 PM |
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Oh yes got it now.
Thats one of the laws that poo poo's perpetual motion.
If you move a wire in a magnetic field it induces a currene. That very current produces a magnetic field that opposes the motion.
Otherwise you would have no resistance to motion and loads of amps - perpetual motion in other words.
Thats how I remembered it but it was 40 years ago I sat that exam!
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austin man
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| posted on 17/6/10 at 09:12 PM |
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http://www.youtube.com/watch?v=bkSsgTQOXVI
Life is like a bowl of fruit, funny how all the weird looking ones are left alone
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eddie99
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| posted on 17/6/10 at 09:18 PM |
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Thanks for that video, that helps explain it. So basically it creates another magnetic field to oppose to motion
EDIT: LCB is by far the best source of info for everything!
[Edited on 17/6/10 by eddie99]
http://www.elitemotorsporteng.co.uk/
Twitter: @Elitemotoreng
Facebook: http://www.facebook.com/pages/Elite-Motorsport-Engineering/153409081394323
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v8kid
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| posted on 17/6/10 at 10:45 PM |
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Still think you should read up on Flemings rules! Let us know how it goes.
Cheers
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eddie99
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| posted on 18/6/10 at 12:20 PM |
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Saw the post this morning and looked up and learnt the flemings left hand rule. That came up and i was able to unload my knowledge, unfortunately not
one thing came up about Lenz's law and eddy currents but oh well, general knowledge has improved 
http://www.elitemotorsporteng.co.uk/
Twitter: @Elitemotoreng
Facebook: http://www.facebook.com/pages/Elite-Motorsport-Engineering/153409081394323
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v8kid
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| posted on 18/6/10 at 05:28 PM |
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Sods law I guess.
I used to analyse the cource material and work out what areas it would be difficult to question in a 3 hour exam, what were easy to question and what
were key to understanding the subject. Trouble was it was so much work to do this that I studied the whole area to find out and ended up knowing it
all (for a short period of time anyhow!!)
Your tutor/lecturer should have guided you on the questions to expect if he/she was worth anythin.
Cheers and enjoy the studying
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