Lesson Plan

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Lesson Plan
Grade: Date: 25/02/2026
Subject: Physics
Lesson Topic: Know that the relative strength of a magnetic field is represented by the spacing of the magnetic field lines
Learning Objective/s:
  • Describe how magnetic field line spacing indicates relative field strength.
  • Explain why field lines are denser near poles and inside a solenoid.
  • Interpret diagrams to identify regions of strong and weak magnetic fields.
  • Apply the concept to predict compass behavior in different field regions.
Materials Needed:
  • Projector and screen
  • Printed magnetic‑field diagrams
  • Bar magnets and a solenoid model
  • Compasses
  • Student worksheets
  • Whiteboard and markers
 Introduction:
Begin with a striking image of a bar magnet surrounded by densely packed field lines and ask students what the spacing might mean. Recall that they have previously identified north and south poles and how a compass aligns with a magnetic field. Today they will determine how line spacing represents field strength and will be able to explain variations across a magnet.
Lesson Structure:
  1. Do‑now (5’) – quick sketch of field lines, label dense vs sparse; teacher circulates to check.
  2. Mini‑lecture (10’) – explain line‑spacing concept using projector and diagrams.
  3. Guided inquiry (15’) – pairs use bar magnets and compasses, record observations on worksheet.
  4. Demonstration (10’) – show energized solenoid, discuss uniform dense lines inside and spreading outside.
  5. Misconception check (5’) – discuss common errors and have students correct statements.
  6. Quick‑check quiz (5’) – three short questions, peer‑grade.
Conclusion:
Summarise that closer field lines mean a stronger magnetic field and that this visual cue helps predict forces on compasses and moving charges. Students complete an exit ticket describing one real‑world example of field‑line spacing. Assign homework to draw and label field lines for a bar magnet and a solenoid.