alleryMutual inductance M between two coils is defined such that the emf induced in coil 2 due to changing current in coil 1 is
Aε₂ = −M · dI₁/dt
Bε₂ = +M · I₁ · t
Cε₂ = M / (dI₁/dt)
Dε₂ = −M · I₁
Answer & Solution
Correct answer: A. ε₂ = −M · dI₁/dt
ε₂ = −M dI₁/dt.
By symmetry, M₁₂ = M₂₁ (Neumann's formula). M units: henry.
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