# B Magnetic field around a finite wire with different diameter

1. Oct 30, 2016

### Agnelo

In my simulation I have a wire with a fixed current flowing, I observed if I change the diameter of the wire the magnetic field (B) in a fixed point of the space also changes, is it correct?

2. Oct 30, 2016

### tech99

That does not seem correct, as the magnetic field depends only the current.

3. Oct 30, 2016

### Agnelo

Yeah, I am agree, only the length affects the measurement, but in this case the length does not change, only the diameter, I dont understand whats wrong...

I have a wire with a 0.05A current over a measurement point at 0.03mm (border of wire), the length of wire is 5.08mm and the diameter is 0.025mm or 0.05mm...

4. Oct 30, 2016

### davenn

with everything on such a tiny scale, I wouldn't be surprised if it was just measurement error

1) why such small lengths of wire and measurement distance and current ?
2) how are you measuring the B field strength ?

5. Oct 30, 2016

### jartsa

How did you place the thick wire on the same position where the thin wire was? Oh yes, nearest point 0.03 mm from the fixed point ... so part of the thick wire is too far from the fixed point.