PhysicsChapter 6: Electrostatics

Electric Field Strength

Introduction

Electric field strength at a point is the force experienced per unit positive test charge. E = Fq where: `E` = field strength; `F` = electric force; `q` = test charge. Unit: N/C

Definition

Point Charge

For a point charge: **E = k|Q|/r²**

Direction

For positive source charge, field points outward. For negative source charge, field points inward.

Uniform Field

Between large parallel plates: **E ≈ Vd** where: `V` = potential difference; `d` = plate separation.

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