Magnetic field at end of long solenoid (B_end ≈ μ₀nI/2)
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B_end ≈ μ₀nI/2
What each symbol means
| Symbol | What it stands for |
|---|---|
| I | Current (A) |
| n | Turns per unit length (m⁻¹) |
| B_end | Magnetic field magnitude near open end of long solenoid (T) |
When to use this
Long solenoid: field at open end is approximately half the deep interior value.