1. EM Waves complete basics | Maxwell's Equations | Electromagnetic Waves Waves | 12th #cbse #neet

PHYSICS with Umesh Rajoria24 minutes read

The chapter on Electromagnetic Waves covers various types like radio waves, microwaves, and gamma rays, detailing properties, production, and daily life use. Maxwell's discovery of displacement current explained the interconnection of electricity and magnetism, leading to the production of electromagnetic waves.

Insights

  • Maxwell's experiment with a charging capacitor revealed the concept of displacement current, which balances incoming and outgoing currents, satisfying Kirchhoff's current law.
  • The discovery of displacement current by Maxwell connected electricity and magnetism, leading to the production of electromagnetic waves and the formulation of Maxwell Equations, which encompass key laws governing electromagnetism.

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Recent questions

  • What are the different types of electromagnetic waves?

    Radio waves, microwaves, infrared waves, light, and gamma rays.

  • How did Maxwell's experiment with a charging capacitor impact electromagnetic theory?

    Revealed failures in Kirchhoff's current law and Ampere's circuital law.

  • What is the significance of Faraday and Henry's experiments in electromagnetic induction?

    Led to laws showing changing magnetic flux induces current.

  • How does displacement current balance incoming and outgoing currents in a capacitor?

    Flows between plates due to a variable electric field.

  • What are Maxwell Equations and their significance in electromagnetism?

    Encompass Gauss's Law, Faraday's Law, and more.

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Summary

00:00

"Electromagnetic Waves: Properties, Production, and Laws"

  • Electromagnetic Waves chapter covers various types like radio waves, microwaves, infrared waves, light, and gamma rays.
  • Detailed study includes properties, production, daily life use, and discovery of electromagnetic waves.
  • Scientist Rested's experiment showed current in a wire produces a magnetic field, linking electricity and magnetism.
  • Faraday and Henry's experiments led to laws of electromagnetic induction, showing changing magnetic flux induces current.
  • Maxwell's experiment with a charging capacitor revealed failures in Kirchhoff's current law and Ampere's circuital law.
  • During capacitor charging, incoming current on plates led to the concept of displacement current between the plates.
  • Displacement current, flowing between the plates due to a variable electric field, balances incoming and outgoing currents.
  • The concept of displacement current was introduced to explain the magnetic field between the plates during capacitor charging.
  • Displacement current acts as a replacement for conduction current, ensuring Kirchhoff's current law is satisfied.
  • Understanding displacement current helps reconcile the failures of Kirchhoff's current law and Ampere's circuital law during capacitor charging.

13:43

Understanding Maxwell's Equations and Electromagnetic Waves

  • Conduction current in wires and capacitor charging: Conduction current flows in wires during capacitor charging.
  • Displacement current and cutoff current law: Displacement current must equal conduction current for cutoff current law to be satisfied.
  • Ampere current law and Ampere circulator law: Ampere current law can be satisfied by applying Ampere circulator law in a loop with assumed displacement current.
  • Source of displacement current: Variable electric field is the source of displacement current.
  • Displacement current formula: Displacement current formula is ID = F / t, where F is the change in electric flux with respect to time.
  • Relationship between conduction and displacement current: Conduction and displacement currents are always equal in magnitude.
  • Maxwell's discovery and electromagnetic waves: Maxwell's discovery of displacement current led to understanding the interconnection of electricity and magnetism, resulting in the production of electromagnetic waves.
  • Maxwell Equations: Maxwell Equations encompass Gauss's Law in Electrostatics, Gauss's Law in Magnetism, and Faraday's Law of Electromagnetic Induction.
  • Lorenz force formula: Lorenz force formula calculates the force on a charged particle moving in an electric and magnetic field.
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