Physics - Senior Secondary 2 - Magnetic Field

Magnetic Field

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TERM: 3RD TERM

WEEK: 7

Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Magnetic Field
Subtopics:
• The Earth’s Magnetic Field
• Magnetic Elements of a Place:

  • Angle of Declination
  • Angle of Dip
  • Horizontal Component of the Earth’s Magnetic Field
  • Bar Magnet in Earth’s Field: Neutral Point
  • Mariner’s Compass

 

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

  1. Define the Earth’s magnetic field and its importance.
  2. Identify the magnetic elements of a place: angle of declination, angle of dip, and horizontal component of the Earth’s magnetic field.
  3. Explain the concept of the neutral point in a bar magnet.
  4. Understand how a mariner’s compass works.
  5. Investigate the Earth’s N-S direction using a bar magnet.

 

INSTRUCTIONAL TECHNIQUES:
• Explanation
• Demonstration
• Hands-on Activity: Using a bar magnet to locate the Earth's N-S direction
• Questions and Answers
• Video clips on Earth’s magnetic field and compass use

 

INSTRUCTIONAL MATERIALS:
• Bar magnets
• Compass
• Physics textbook
• Whiteboard markers
• Videos on Earth’s magnetic field
• Laboratory setup for experiments

 

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

STEP 1: INTRODUCTION
• The teacher will ask students what they know about magnets and the Earth’s magnetic field.
• Students will be encouraged to discuss any prior knowledge about compasses and magnetic poles.

STEP 2: EXPLANATION
• The teacher explains the Earth’s magnetic field and its significance.
• Magnetic elements of a place will be introduced:

  • Angle of Declination: The angle between the magnetic North and the geographic North.
  • Angle of Dip: The angle between the horizontal plane and the magnetic field lines.
  • Horizontal Component: The projection of the magnetic field on the horizontal plane.

STEP 3: DEMONSTRATION
• The teacher demonstrates how a bar magnet behaves when placed in the Earth’s magnetic field.
• Students will observe how the bar magnet aligns with the Earth’s magnetic poles.

STEP 4: HANDS-ON ACTIVITY
• Students will use a bar magnet to find the neutral point of the Earth’s magnetic field.
• They will suspend a bar magnet horizontally and locate the Earth’s N-S direction.

STEP 5: NOTE TAKING
• The teacher writes key points on the board, including the definition of the Earth’s magnetic field, magnetic elements, and the working of a mariner’s compass.

NOTE
• The Earth behaves like a giant magnet, with a magnetic field that has magnetic poles near the geographic poles.
• Neutral Point: The point where the magnetic fields of the Earth and the bar magnet cancel each other out.
• The Mariner’s Compass uses the Earth’s magnetic field to show direction.

 

EVALUATION

  1. What is the angle of declination?
  2. Describe the function of the Earth’s magnetic field.
  3. How does a mariner’s compass work?
  4. Explain the concept of a neutral point.

CLASSWORK:
• Draw a diagram showing the Earth’s magnetic field and label the magnetic elements.
• Define and explain the angle of dip.

 

CONCLUSION:
• The teacher reviews the answers and provides feedback.
• Students are encouraged to reflect on the importance of understanding magnetic fields in navigation.