Electromagnetic Theory Lesson 8 (v2) Coulomb's Law & Electric Field

Описание: In this lesson we introduce the two foundational concepts of electrostatics: Coulomb's Law and the Electric Field. We derive the vector force between point charges, work through a numerical example, define the electric field as force per unit charge, show how it reduces to Q/(4πε₀r²) for a point charge, and apply the superposition principle with a two-charge example.

Timestamps:
0:00 Intro
0:03 Recap & This Lesson
0:28 Coulomb's Law & Worked Example
2:01 The Electric Field & Superposition Example
4:05 Summary

Topics covered:
Coulomb's Law: F₁₂ = (q₁q₂)/(4πε₀R²) ê_R — vector form
Permittivity of free space ε₀ and Coulomb constant k ≈ 9×10⁹ N·m²/C²
Like charges repel, opposite charges attract
Worked example: F between +3μC and −2μC separated by 4 m
Electric field definition: E = F/q → E = Q/(4πε₀r²) ê_r
E points radially outward for Q › 0, inward for Q ‹ 0
Superposition: E_total = Σ E_i — vector sum of individual fields
Example: net E from two equal +1μC charges — symmetry cancellation

This video is part of the AcEdumy Electromagnetic Theory series.

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