Magnetic Field of a Straight Wire Calculator

Find the magnetic field around a straight current-carrying wire.

Magnetic field (T) 0

Formula: B = μ₀·I ÷ (2π·r)

Step-by-step with your numbers:

1. Values used:

2. Current = 10 A

3. Distance from wire = 0.05

5. Magnetic field = 0T

Did we solve your problem today?

Current in a wire wraps a circular magnetic field around it.

The math behind it

B = μ₀·I ÷ (2π·r). The field falls off inversely with distance from the wire.

10 A at 5 cm → about 4 × 10⁻⁵ T.

Which way does the field point?

Around the wire, given by the right-hand rule.