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Physics HL

Chapter 20: Electromagnetic Induction

Build full electromagnetic-induction fluency from motional emf and Faraday-Lenz law to RL transients, AC generators, RMS power, and transformer scaling.

Estimated chapter time: 208 minutes

Chapter Topics

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  1. 1How to Read This Electromagnetic Induction Chapter
    1. 1.1Why Induction Is the Energy-Conversion Core of Physics
    2. 1.2Learning Targets
    3. 1.3Recommended Problem-Solving Workflow
  2. 220.1 Motional emf and Magnetic Flux
    1. 2.1Charge Separation in a Moving Conductor
    2. 2.2Deriving the Motional emf Formula
    3. 2.3Flux as Geometry: Phi = BA cos(theta)
  3. 320.2 Faraday's Law and Flux Linkage
    1. 3.1Flux Linkage N Phi
    2. 3.2Faraday's Law as a Rate Law
  4. 420.3 Lenz's Law and Direction Workflows
    1. 4.1What Lenz's Law Actually Opposes
    2. 4.2Entering and Leaving Field Regions
    3. 4.3Why the Minus Sign Matters Physically
  5. 520.4 Self-Induction and RL Transients
    1. 5.1Self-Induction: A Coil Reacts to Its Own Changing Current
    2. 5.2Time Constant and Practical Circuit Behavior
    3. 5.3Magnetic Energy Storage
  6. 620.5 AC Generators and Alternating Current
    1. 6.1Rotating Coil Physics
    2. 6.2Current and Load Dependence
    3. 6.3Physical Interpretation of Alternating Current
  7. 720.6 RMS Power and Transformer Links
    1. 7.1Why RMS Values Are Used
    2. 7.2Transformer Principle from Induction
  8. 8Chapter 20 Wrap-Up
    1. 8.1One Workflow for Most Chapter 20 Questions

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How to Read This Electromagnetic Induction Chapter