How Do You Calculate the Magnetic Field Around a Wire?

[dev-hud]

Hi there, i am facing a question that seem quite simple, i just do not know what formula to use.

the questions is:

A long straight wire carries a current of 2.5 A. Find the magnitude of the magnetic field 25 cm from the wire.

I = 2.5 A
0.025 m

 

[creativepinky]

Hi. That's on the same vein as the one I asked a few threads ago. Find the equation that shows the magnitude B or a magnetic field at a distance r (clue: it's the one with the permeability of free space constant in). Hope that helps