Energy Density Within Solenoid
Energy is stored in the magnetic field inside the solenoid.
• Inductance: L = µ0 n2 A`
• Magnetic field: B = µ0 nI
• Potential energy: U =
1 2
1
LI =
B 2 (A`)
2
2µ0
• Volume of solenoid interior: A`
• Energy density of magnetic field: uB =
1
U
=
B2
A`
2µ0
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