mutual inductance concept

Question

Mutual inductance between two coils depends on?

RankGuru · Accepted Answer

1. **Definition**: Mutual inductance ($M$) is the property where a change in current in one coil induces an emf in a nearby second coil.
2. **Factors**:
   - **Coil Geometry**: Sizes and shapes of both coils.
   - **Turn Count**: $M \propto N_1 N_2$.
   - **Flux Coupling**: Proximity and orientation of coils (distance and angle).
   - **Core Material**: Relative permeability of the magnetic material threading both coils (using a soft iron core greatly increases $M$).
3. **Formula**: $\epsilon_2 = -M \frac{di_1}{dt}$.

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mutual inductance concept

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