For two coupled coils carrying currents I₁ and I₂, the magnetic energy contains a mutual term ±MI₁I₂. Which statements are correct?
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Question

For two coupled coils carrying currents I₁ and I₂, the magnetic energy contains a mutual term ±MI₁I₂. Which statements are correct?

G1 Physics · Accepted Answer

M has the unit henry, not ohm. The energy quadratic form must remain non-negative, requiring M²≤L₁L₂.