Electricity & Magnetism
Magnetic Field (Solenoid)
Uniform magnetic field inside ideal solenoid.
Variables
BT
Magnetic field
Field inside solenoid
μ₀H/m
Permeability
4π×10⁻⁷
n1/m
Turn density
Turns per unit length
IA
Current
Current in solenoid
Derivation
From Ampere's law with rectangular path.
Your notes
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Common questions
What is the Magnetic Field (Solenoid) formula?
Magnetic Field (Solenoid) is written B = μ₀ nI. Uniform magnetic field inside ideal solenoid. It belongs to Electricity & Magnetism, under Magnetism.
What are the units in B = μ₀ nI?
In SI units, B is magnetic field, measured in kg/(A·s²); μ₀ is permeability, measured in kg·m/(A²·s²); n is turn density, measured in 1/m; I is current, measured in A.
How is the Magnetic Field (Solenoid) formula derived?
From Ampere's law with rectangular path. The result is B = μ₀ nI.