# Darn Magnets!

1. Jun 9, 2014

### Manaphy180

Hi, I have two questions that I want to solve correctly... and help is a appreciated.

1. Is the current direction/Poles on right figure correct? https://www.dropbox.com/s/bs3lvak4wda5lqu/23.png

2. This one I'm sure is wrong... not too sure what I'm doing here.... Are the currents correct at all? Poles, arrows were added by me https://www.dropbox.com/s/24iecu3bm6grlq7/25.png

Thanks in advance, If I could get insight or answers ASAP that would be great :D

2. Jun 9, 2014

### Staff: Mentor

3. Jun 10, 2014

### Manaphy180

You're right, I totally forgot about that, Thanks. Do you have any insight into the second question?

Last edited: Jun 10, 2014
4. Jun 10, 2014

### Manaphy180

5. Jun 10, 2014

### stevan

Last edited: Jun 10, 2014
6. Jun 10, 2014

### Simon Bridge

current goes from -ve to +ve
there s a rule for working out the force on a current carrying wire in a magnetic field.

7. Jun 10, 2014

### Staff: Mentor

Using the rule it appears that you've labeled the poles correctly. Im not sure about the cylinder thing. Are you trying to draw an electric motor schematic?

8. Jun 10, 2014

### Manaphy180

Sorry, I should have mentioned that it's a magnet with coil wrapped around it. Would the North to South Pole direction change?

9. Jun 10, 2014

### Manaphy180

Thanks guys, I suppose my real question is about the electromagnetic pole from the North to South pole that acts on the object between. Does it still go from North to South, or does the wire along the magnet interfere with that?

10. Jun 10, 2014

### stevan

I think it still go from north to south, just like ordinary U shaped magnet...

11. Jun 10, 2014

### Manaphy180

So the diagram I drew for my 2nd question was correct? I really want to know that I'm doing this right before I get into it. Thanks

12. Jun 10, 2014

### stevan

I just understand the electromagnet, I don't understand what is between the magnet in your picture sir..
As I know, magnetic field come from the north pole to the south pole...one direction, no way back

13. Jun 11, 2014

### Staff: Mentor

It shouldn't.

14. Jun 11, 2014

### Staff: Mentor

No, it's not correct.

What are all those arrows you've drawn on the wire?

15. Jun 12, 2014

### Simon Bridge

16. Jun 13, 2014

### Staff: Mentor

Don't you just hate that, when you get cross-threaded?

There exist circuits where current goes from - to + ? Where can I find one?

17. Jun 13, 2014

Conventional current?
I don't think so

18. Jun 13, 2014

### PhysicoRaj

In that thread Simon was referring to..