Physics - Senior Secondary 2 - Magnetic Field

Magnetic Field

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TERM: 3RD TERM

WEEK: 5

Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Magnetic Field
Subtopics:

  • Concept of magnetic field
    • Properties of magnets
    • Magnetic flux and flux density
  • Magnetic field around:
    • A bar magnet
    • A straight conductor carrying current
    • A solenoid
  • Methods of making magnets
  • Methods of demagnetization

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

  1. Define a magnetic field and its properties.
  2. Understand the concept of magnetic flux and flux density.
  3. Describe the magnetic field around a bar magnet, conductor, and solenoid.
  4. Explain the methods of making magnets and demagnetization.

INSTRUCTIONAL TECHNIQUES:

  • Explanation
  • Demonstration
  • Questions and answers
  • Hands-on activity: Using a compass and iron filings to observe magnetic fields.

INSTRUCTIONAL MATERIALS:

  • Bar magnet
  • Iron filings
  • Compass
  • Physics textbook
  • Whiteboard markers
  • Videos on magnetic fields

INSTRUCTIONAL PROCEDURES

PERIOD 1-5

PRESENTATION

STEP 1: INTRODUCTION

  • The teacher introduces the concept of a magnetic field.
  • Students share their prior knowledge about magnets.

STEP 2: EXPLANATION

  • Define magnetic field: The region around a magnet where magnetic forces can be detected.
  • Discuss properties of magnets (attract and repel).
  • Define magnetic flux and flux density (the amount of magnetic field passing through a given area).

STEP 3: DEMONSTRATION

  • Demonstrate the magnetic field around a bar magnet using iron filings.
  • Show the magnetic field lines around a straight conductor carrying current using a compass.
  • Discuss the magnetic field around a solenoid.

STEP 4: HANDS-ON ACTIVITY

  • Students will use a compass and iron filings to observe the magnetic field around a bar magnet and solenoid.

STEP 5: NOTE TAKING

  • The teacher writes a summary note on the board that students will copy.

NOTE

  • Magnetic Field: A field around a magnet where magnetic forces can be detected.
  • Magnetic Flux (Φ): The total magnetic field passing through a given area.
  • Flux Density (B): The strength of the magnetic field, measured in Tesla (T).
  • Magnetic Field Lines: Lines that represent the direction and strength of a magnetic field.
  • Magnetic Field Around a Bar Magnet: The field lines spread out from the north pole and curve back into the south pole.
  • Magnetic Field Around a Solenoid: Similar to a bar magnet, with a distinct north and south pole.

 

EVALUATION

  1. What is a magnetic field?
  2. Explain how magnetic flux and flux density are related.
  3. Describe the magnetic field lines around a bar magnet.
  4. What are the methods of making magnets?

CLASSWORK:

  • Use a compass to draw the magnetic field lines around a bar magnet.

 

CONCLUSION:

  • The teacher will review students' answers and provide feedback.

Discuss the practical applications of magnets in daily life and technology.