Lesson Plan

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Lesson Plan
Grade: Date: 01/12/2025
Subject: Physics
Lesson Topic: represent a magnetic field by field lines
Learning Objective/s:
  • Describe the concept of a magnetic field and its representation by field lines.
  • Explain the rules for drawing magnetic field lines and how line density indicates field strength.
  • Apply the right‑hand rule to determine the direction of magnetic fields around current‑carrying conductors.
  • Predict the direction of magnetic forces on conductors using field‑line concepts.
Materials Needed:
  • Projector and screen for diagrams
  • Whiteboard and markers
  • Printed worksheet with drawing tasks
  • Bar magnet, straight current‑carrying wire setup, and power supply for demonstration
  • Compass (optional) to visualise Earth’s field
  • Rulers and coloured pencils for student sketches
 Introduction:

Begin with a quick demonstration: hold a bar magnet under a sheet of paper and sprinkle iron filings to reveal invisible field lines. Ask students what they notice about the pattern and link it to prior knowledge of magnetic poles. Explain that today they will learn how to represent magnetic fields using field lines and how these diagrams convey direction and strength. Success will be measured by accurate sketches and correct application of right‑hand rules.
Lesson Structure:
  1. Do‑now (5'): Students answer a short recall question on magnetic poles on the board.
  2. Mini‑lecture (10'): Define magnetic field, introduce field‑line conventions, and show slides.
  3. Guided drawing (12'): Demonstrate drawing field lines for a bar magnet; students sketch on worksheet.
  4. Hands‑on demo (10'): Use bar magnet with iron filings and a current‑carrying wire with compass; discuss line density and direction.
  5. Right‑hand rule practice (8'): Pairs apply the right‑hand rule to various current configurations and record B direction.
  6. Formative check (5'): Quick exit‑ticket quiz where students label diagrams of field lines for a solenoid and a straight wire.
Conclusion:

Review how field‑line density indicates field strength and how the right‑hand rule links current direction to field orientation. Students complete an exit ticket summarising the key rules, and homework is to draw and label field lines for a solenoid and the Earth’s dipole field.