Ampère's circuital law (∮B·dl = μ₀ I_enc)
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∮B·dl = μ₀ I_enc
What each symbol means
| Symbol | What it stands for |
|---|---|
| I_enc | Net steady current passing through any surface bounded by Amperian loop |
When to use this
Magnetostatics / steady currents; symmetry needed to pull B outside integral in standard applications.