Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Physics
Lesson Topic: Explain that magnetic forces are due to interactions between magnetic fields
Learning Objective/s:
  • Describe the nature of magnetic fields around magnets and current‑carrying conductors.
  • Explain how overlapping magnetic fields produce attractive or repulsive forces.
  • Apply the formula F = BIL sinθ to calculate the magnetic force on a straight conductor.
  • Analyse everyday phenomena (compass, bar magnets, electromagnets) as interactions of magnetic fields.
Materials Needed:
  • Bar magnets (pairs)
  • Compass
  • Solenoid with iron core (or coil)
  • Power supply and connecting wires
  • Ruler or measuring tape
  • Projector or interactive whiteboard
  • Worksheet with practice questions
  • Calculator
 Introduction:
Begin with a quick demonstration: place two bar magnets near each other and ask students to predict whether they will attract or repel. Recall previous learning about magnetic poles and field lines. Explain that today they will discover how the interaction of magnetic fields generates the forces they observed, and they will be able to predict and calculate these forces.
Lesson Structure:
  1. Do‑Now (5 min): Short worksheet question on magnetic field lines.
  2. Mini‑lecture with diagrams (10 min): Define magnetic field and illustrate field lines around a bar magnet using the projector.
  3. Guided inquiry (12 min): Demonstrate overlapping fields with two magnets; students record observations and link to attraction/repulsion rules.
  4. Formula application (10 min): Derive F = BIL sinθ and solve an example problem together.
  5. Hands‑on activity (15 min): Groups set up a current‑carrying straight wire in a uniform magnetic field (solenoid) and determine force direction; calculate the force.
  6. Consolidation quiz (5 min): Exit‑ticket scenario requiring prediction of force direction.
Conclusion:
Summarise that magnetic forces arise from the interaction of magnetic fields and that the direction depends on field orientation. Have students write one key takeaway on a sticky note as an exit ticket. For homework, assign the practice questions from the source to reinforce calculation and conceptual understanding.