This lesson covers the concept of force equations in relation to magnetic fields and the energy stored at the air gap. It begins with a discussion on energy stored in the air gap and force equations in terms of air gap fields. The lesson then delves into the derivation of various equations related to magnetic fields. The lesson also explains the concept of fringing flux and how it affects the magnetic field. It further discusses the derivation of the force equation and introduces the concept of magnetic pressure. Towards the end, the lesson explores the force equations with respect to multiple winding excitation and concludes with the derivation of the final torque equation.

- The energy stored in the air gap and the force equations in terms of air gap fields are crucial in understanding magnetic fields.
- Ampere's law helps in deriving various equations related to magnetic fields.
- Fringing flux, which goes outside the area, affects the magnetic field.
- The force equation and the concept of magnetic pressure are important aspects of this topic.
- Torque equation is derived based on the change in self-inductance with respect to the angular displacement.

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