# Homework Help: Square Loop

1. Dec 1, 2009

### tag16

1. The problem statement, all variables and given/known data
A square loop of wire with a side of 10cm carries a current of 0.3A. What is the
magnetic field in the center of the square loop?

2. Relevant equations

B= 2($$\sqrt{}$$2)$$\mu$$I/$$\pi$$L

$$\mu$$=IA

3. The attempt at a solution

Not sure if these are the right equations for this problem and if they aren't then I have no idea what to do. If they are then I just need to know what the area would be.

2. Dec 1, 2009

### ApexOfDE

Can you find a magnetic field created by 1 segment of a loop? It is similar to finding a magnetic field caused by long wire with current I.

3. Dec 1, 2009

### tag16

B= $$\mu$$I/ 2$$\pi$$a

Is this right?

4. Dec 1, 2009

### ApexOfDE

sqrt(2), i think.

5. Dec 2, 2009

### tag16

so B= ($$\sqrt{}$$2)$$\mu$$I/2$$\pi$$a ?

6. Dec 2, 2009

### ApexOfDE

It is just a magnitude of field due to 1 segment of a loop. Multiply it with 4. :)

7. Dec 2, 2009

### tag16

ok so that equation times 4. Thanks

8. Dec 2, 2009

### tag16

oh and I'm still not really sure what the area would be, I need it to figure out what $$\mu$$ is.

9. Dec 2, 2009

### ApexOfDE

10. Dec 2, 2009

### tag16

oh yeah, I forgot about that. Thanks again.