μ₀ from Long Straight Wire: B = μ₀I/(2πr)

At fixed r, measure B for several I. Slope of B vs I is μ₀/(2πr).

School· 24 min·Related simulator: Biot–Savart Law

Goal

Extract μ₀ (sim uses r = 0.1 m).

Equipment

  • Wire, probe

Theory

B = μ₀I / (2πr).

Procedure

  1. I, B.

Experiment

Conclusion

μ₀ agrees with 4π×10⁻⁷ H/m.