Physics

Mutual inductance describes how a changing current in one coil induces a voltage in another—it's the core of transformer action. The key insight is that the induced EMF in the secondary depends only on how fast the current is changing in the primary, not on the current values themselves. Use Faraday's law for mutual inductance: $\mathcal{E} = M\frac{dI}{dt}$, where $M$ is what you're solving for and $\frac{dI}{dt}$ is the rate of current change.

Mutual inductance describes how a changing current in one coil induces a voltage in another—it's the core of transformer action. The key insight is that the induced EMF in the secondary depends only on how fast the current is changing in the primary, not on the current values themselves. Use Faraday's law for mutual inductance: $\mathcal{E} = M\frac{dI}{dt}$, where $M$ is what you're solving for and $\frac{dI}{dt}$ is the rate of current change.