XT

I have a nice uni assignment to submit on Friday. Anyone kind enough to help ?

1. Describe how a magnetic field may be detected around a current carrying wire and explain the concept of flux lines.

2. Show the flux distribution around two wires a distance 0.1 m apart carrying a current of 400 mA in the same direction, and calculate the force between them. ( Assume o = 4 * 10 -7 )
Explain two applications where electromagnets are used.

3. Calculate the flux density existing in an area of 400 mm2 if a uniform magnetic field of 300 Wb exists at right angles to that area. (15 marks)

4. Calculate the m.m.f. ( magneto-motive-force ) produced by a current of 1.5 A flowing in a 300 turn coil.

5. A current of 2.3 A flows in a coil of 500 turns which is wound on a ring of mean circumference of 25 cm. Determine the magneto- motive force and the magnetic field strength.

6. Calculate the flux density produced inside an air-cored coil with a magnetic field strength of 4600 A/m. (o = 4 * 10 -7 )

7. In the Figure is shown an iron ring of reluctance 15 * 106 A / Wb wound with a coil of 100 turns. Calculate the current required to maintain a flux of 20 Wb in the iron.



PS. The boxes are mi(greek m) zero

ajm

Try and get the attention of AndyC_772, I think he is a Leccy Engineer

If you've got no answers by tomorrow I may have a crack at this myself for old times sake!

logiclee

Oooooohhh, this brings back some painfull memories.

Just off to bed for a 4am start, I'll try and remember a few tommorow if no ones replied.

Cheers
Lee

ALi-B

iTrader: (1)

Oh bloody hell, I know this, I've done all this. I should know this

Can I remember it from uni? can I hell

I do have all the textbooks and lecture notes stored away. But by the time I've dug out the revlevent info you probably have worked it out.

Btw...in the real world..it's useless

AndyC_772

iTrader: (2)

Sorry guys, I did this stuff years ago - and flushed it all out of my brain with beer shortly after finals I've not needed it since

ajm

Yeah same here. I too would have to give myself a refresher course on this to answer the question.... which I would be happy to do because it never pays to let the brain get idle.... the thing is, if I am willling to do that in order to answer the question, why isn't XT willing?.... and it should be fresher in his mind than anyone elses!

XT, have a stab at it first, then come back if you get stuck you lazy git!

matt.bowey

Dont take this the wrong way, but surely your uni notes will have covered this??? have you had a go yourself.....?!?

what uni are you at cos not meny do this sort of thing anymore!!

If not, take a look in the Elecrtrical Engineering Book by Hughes, that will help for sure!!