🔍 Main Idea: Mutual induction happens when a change in current in one coil (let's call it Coil A) induces an emf in a nearby coil (we'll name it Coil B) because of a change in magnetic flux linkage. Imagine it as two friends: when one speaks (changes current), the other listens (gets an induced emf)!

• Magnetic Flux Density: Think of it as the concentration of magnetic field lines. More lines = denser magnetic field.
  • Real-World Example: It's like crowd density at a concert! The more fans (field lines) packed into an area, the denser the crowd (magnetic flux).
• Flux Linkage: This is about how many of those magnetic field lines pass through or "link" with another coil.
  • Real-World Example: Imagine sun rays hitting a window. The more rays (field lines) that pass through the window (the coil), the more the room inside is 'linked' with sunlight!