Calculate the magnetic flux density (B) created by a long, straight, current-carrying wire.
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Enter current and distance to calculate
About this calculator
Overview
Ampère's Law states that a current-carrying wire produces a magnetic field. For an infinitely long straight wire, the field strength at a distance 'r' is determined by the total current and the magnetic permeability of the medium.
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Pro Tips
The magnetic field lines form concentric circles around the wire.
The field strength (B) decreases linearly as the distance (r) from the wire increases.
Use the 'Right-Hand Rule': point your thumb in the direction of the current, and your fingers will curl in the direction of the magnetic field.
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Fun Facts
"The units of magnetic flux density are Teslas (T) or Gauss (G). 1 Tesla = 10,000 Gauss."
"The Earth's magnetic field is roughly 0.00005 Tesla (50 microTesla)."
"Power lines carrying high currents can produce measurable magnetic fields on the ground nearby."
