| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: recall and use the equation F = BIL sin θ, with directions as interpreted by Fleming’s left-hand rule |
Learning Objective/s:
- Describe the relationship between magnetic field, current, conductor length, and the resulting force using F = B I L sin θ.
- Apply Fleming’s left‑hand rule to determine the direction of the magnetic force on a current‑carrying conductor.
- Calculate the magnitude of the force for given values of B, I, L, and θ and interpret the result in real‑world contexts.
- Identify and correct common errors such as confusing current direction or omitting the sin θ factor.
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Materials Needed:
- Projector and screen
- Whiteboard and markers
- Printed worksheet with practice questions
- Diagram of Fleming’s left‑hand rule (handout or slide)
- Calculator for each student
- Bar magnet and a straight current‑carrying wire set‑up
- Lab safety goggles
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Introduction:
Imagine a motor that turns because a wire feels a push in a magnetic field. Students already know the basics of magnetic fields and electric current. Today they will learn how to quantify that push with the equation F = B I L sin θ and use Fleming’s left‑hand rule to find its direction. Success will be shown by correctly calculating force magnitude and stating its direction for a given scenario.
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Lesson Structure:
- Do‑now (5') – Quick quiz on magnetic field vectors and current direction.
- Mini‑lecture (10') – Derive F = B I L sin θ, explain each symbol and show the vector form F = I L × B.
- Demonstration (8') – Use a bar magnet and a current‑carrying wire; apply Fleming’s left‑hand rule live to predict force direction.
- Guided practice (12') – Work through the worked example together; students fill steps on the worksheet.
- Independent practice (10') – Students solve the three practice questions while the teacher circulates.
- Check for understanding (5') – Clicker questions on common pitfalls (current vs. electron flow, sin θ factor).
- Recap & exit ticket (5') – Students write one correct statement about the force and one misconception they corrected.
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Conclusion:
We reviewed how the magnitude and direction of the magnetic force are obtained using the equation and Fleming’s left‑hand rule. The exit ticket confirmed that students can apply both correctly. For homework, they will complete a set of additional problems that require drawing the left‑hand rule and calculating forces for non‑perpendicular arrangements.
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