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Al Azhar 9th Grade Lesson Notes

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Al Azhar 9th Grade Lesson Notes

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Chapter 1 - Atoms & Molecules

Atom: Introduction

Electron Configuration

Chapter 2 - Static Electricity

Coulomb's Law

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Definition

Coulomb's law is a law that explains the releationship between 2 or more electrical charges.

This law states that: "The magnitude, or absolute value, of the attractive or repulsive electrostatic force between two point charges is directly proportional to the product of the magnitudes of their charges and inversely proportional to the squared distance between them."^[1]

Formula

+ F = k ^{Q₁ × Q₂}⁄_r² +

+ where,
+

F = Force (Newton)
r = Distance (Metres)
Q₁ = Charge 1 (Coulomb)
Q² = Charge 2 (Coulomb)
K = Constant = 9 × 10⁹ Nm² / C²

Unit Conversions (for Coulomb)

n mC (milliCoulomb) = n * 10^-3 C
n MC (MicroCoulomb) = n * 10^-6 C
n nC (nanoCoulomb) = n * 10^-9 C
n Å (Ångström) = n * 10¹⁰ C

Example

Given:

+ r = 30 cm = 0,3 m = 3 × 10^-1 m
+ Q₁ = 2 MC = 2 × 10^-6
+ Q₂ = 3 MC = 3 × 10^-6
+

Solution:

+ F = k ^{Q₁ × Q₂}⁄_r²
+ + F = 9 × 10⁹^{2 × 10^-6 ‧ 3 × 10^-6}⁄_{(3 × 10^-1)²} = ^{9 × 10⁹ ‧ 2 × 10^-6 ‧ 3 × 10^-6}⁄_{9 × 10^-2}
+ + = ^{10⁹ ‧ 2 × 10^-6 ‧ 3 × 10^-6}⁄_10^-2 = ^{10^-3 × 6}⁄_10^-2
+ + = 6 × 10^-1 +

References

Coulomb, 1785. "Second mémoire sur l'électricité et le magnétisme"

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Lesson 1: Bab 1 - Materi 1

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Al Azhar 9th Grade Lesson Notes

Al Azhar 9th Grade Lesson Notes

Table of Contents

Table of Contents

Chapter 1 - Atoms & Molecules

Chapter 2 - Static Electricity

Al Azhar 9th Grade Lesson Notes

Table of Contents

Coulomb's Law

Chapter 2

Definition

Formula

Unit Conversions (for Coulomb)

Example

Given:

Solution:

References

Al Azhar 9th Grade Lesson Notes

Table of Contents

Root

Chapter 1

Lesson 1: Bab 1 - Materi 1