The energy stored in a space with a magnetic field. When a magnetic field is created by a magnet and electric current, the magnetic energy is equal to the sum of the magnetic energy due to the magnet alone and the magnetic energy due to the current alone. If the magnetic field due to the magnet alone is Hm and the magnetic field due to the current alone is Hc , then the magnetic energy per unit volume of the medium space is μ( Hm2 + Hc2 )/2, assuming that the magnetic permeability μ is constant. For example , the total energy of the magnetic field created in the space around a current circuit is LI2 /2 , where I is the current and L is the self-inductance of the circuit. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
磁場のある空間にたくわえられているエネルギー。磁石と電流によって磁場がつくられているとき,磁気エネルギーは磁石だけによるものと電流だけによるものとの和に等しい。磁石だけによる磁場を Hm ,電流だけによる磁場を Hc とするとき,媒質空間の単位体積についての磁気エネルギーは,透磁率 μ が一定の場合,μ(Hm2+Hc2)/2 となる。たとえば1つの電流回路がまわりの空間につくる磁場の全エネルギーは,電流を I ,回路の自己インダクタンスを L とすれば LI2/2 である。
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