Physics - Senior Secondary 2 - Electric Field - Electric Force between Point Charges (Coulomb's Law)

TERM: 3^RD TERM

WEEK: 3

Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Electric Field – Electric Force between Point Charges (Coulomb’s Law)
Subtopics:
• Concept of electric field
• Electric field intensity
• Electric potential

SPECIFIC OBJECTIVES:
By the end of the lesson, students should be able to:

1. Explain Coulomb’s Law and calculate the electric force between two charges.
2. Define electric field intensity and electric potential.
3. Compare electric force with gravitational force.

INSTRUCTIONAL TECHNIQUES:
• Explanation
• Demonstration
• Questions and answers
• Hands-on activity: Calculation of electric force
• Video clips on Coulomb’s Law and electric fields

INSTRUCTIONAL MATERIALS:
• Point charge setup
• Physics textbook
• Whiteboard markers
• Videos on Coulomb’s Law

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

PRESENTATION
STEP 1: INTRODUCTION
• The teacher introduces the concept of electric force between point charges and Coulomb’s Law.
• Students are asked if they have noticed how static electricity can cause attraction or repulsion between objects.

STEP 2: EXPLANATION
• The teacher explains Coulomb’s Law, which states that the force between two point charges is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
• Formula:
F=kq₁q₂r²F
where F is the force, q₁ and q₂ are the charges, r is the distance between the charges, and k is Coulomb's constant.

STEP 3: DEMONSTRATION
• The teacher demonstrates the calculation of electric force using a sample problem.

STEP 4: CONCEPTS OF ELECTRIC FIELD AND POTENTIAL
• The teacher introduces the concept of electric field and electric potential.
• Electric field intensity is defined as the force per unit charge.

STEP 5: NOTE TAKING
• The teacher writes summary notes on the board for students to copy.
NOTE:

• Coulomb’s Law: Describes the force between two point charges.
• Electric Field Intensity: The force per unit charge at a point in an electric field.
• Electric Potential: The amount of work done to move a unit charge from a reference point to a specific point in an electric field.

EVALUATION

1. State Coulomb’s Law.
2. Calculate the electric force between two charges of 2 C and 3 C separated by 1 meter.
3. Define electric field intensity.
   CLASSWORK:
   Compare the electric force between two charges with the gravitational force between two protons.

CONCLUSION
• The teacher will review the answers with the students and provide feedback.
• Students are encouraged to reflect on the relationship between electric and gravitational forces.