- #1
jameson2
- 53
- 0
Isn't exactly a homework question, but it seems like it should go here.
This is a page from my notes that I'm having trouble understanding. Basically, it's calculating the magnetic field of a dipole by considering a current loop and using the Biot Savart law. http://img257.imageshack.us/i/magneticp.jpg/
I can see that B_A will just be 4 times the contribution from one side. I don't see why it's sin though. I take that to mean that you're taking the horizontal effect of the magnetic field. But wouldn't this cancel out taking the 4 sides' contribution? I'm also wondering how the vertical effect of the magnetic field at A is taken into account.
I'm also wondering what the epsilon the B_B calculation is referring to.
Finally I don't quite understand how to get from the B_A and B_B answers to the last two lines of equations.
Thanks
This is a page from my notes that I'm having trouble understanding. Basically, it's calculating the magnetic field of a dipole by considering a current loop and using the Biot Savart law. http://img257.imageshack.us/i/magneticp.jpg/
I can see that B_A will just be 4 times the contribution from one side. I don't see why it's sin though. I take that to mean that you're taking the horizontal effect of the magnetic field. But wouldn't this cancel out taking the 4 sides' contribution? I'm also wondering how the vertical effect of the magnetic field at A is taken into account.
I'm also wondering what the epsilon the B_B calculation is referring to.
Finally I don't quite understand how to get from the B_A and B_B answers to the last two lines of equations.
Thanks