# What is Energy stored in a Magnetic Field?

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by Ryan

KEY POINTSThe formula for the energy stored in a magnetic field is E = 1/2 LI2.The energy stored in a magnetic field is equal to the work needed to produce a current through theinductor.Energy is stored in a magnetic field. Energy density can be written as $u_B = \frac{B^2}{2\mu}$.TERMInductorA device or circuit component that exhibits significant self-inductance; a device which stores energy in a magnetic field.EXAMPLEA simple generator uses inductance to create a current by the rotation of a magnet within a coil of wire. This changing magnetic flux produces an EMF which then drives a current.