Magnetic Field of a Straight Current-Carrying Wire

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Calculates the magnetic field strength at a distance from a long, straight wire carrying current.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Current (I) in the wire and Distance (r) from the wire in the units shown.

Step 2

Read Magnetic Permeability of Free Space (μ₀) and Magnetic Field Strength (B) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Current (I) in the wire: 1 Amperes; Distance (r) from the wire: 0.1 meters

Magnetic Permeability of Free Space (μ₀): 0.000001256637061 T⋅m/A; Magnetic Field Strength (B): 0.000002 Tesla

Current (I) in the wire: 2 Amperes; Distance (r) from the wire: 0.2 meters

Magnetic Permeability of Free Space (μ₀): 0.000001256637061 T⋅m/A; Magnetic Field Strength (B): 0.000002 Tesla

Current (I) in the wire: 5 Amperes; Distance (r) from the wire: 0.05 meters

Magnetic Permeability of Free Space (μ₀): 0.000001256637061 T⋅m/A; Magnetic Field Strength (B): 0.00002 Tesla

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