`B = k/c^2*(2* I )/ r `

Enter a value for all fields

The Magnetic Field (long, straight wire) is  found using the following formula: `B=k/c^2*(2*I)/r`, where:

• `B` = Magnetic Field created by a long, straight wire carrying current `I`
• `k` = Coulomb's Constant ()
• `c` = relativity constant (speed of light - 2.99792458E8 m/s)
• `I` = current
• `r` = distance from the center wire

References

24.2 Calculating magnetic fields and forces by Benjamin Crowell, Light and Matter  licensed under the Creative Commons Attribution-ShareAlike license.