| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: define magnetic flux as the product of the magnetic flux density and the cross-sectional area perpendicular to the direction of the magnetic flux density |
Learning Objective/s:
- Describe magnetic flux and its relationship to magnetic flux density and area.
- Calculate magnetic flux for uniform fields using Φ = B A cosθ.
- Analyze special cases where the field is perpendicular or parallel to the area.
- Apply the concept to solve problems involving coils and rectangular surfaces.
|
Materials Needed:
- Projector or interactive whiteboard
- Diagram handouts of magnetic field and area
- Calculators
- Worksheet with practice problems
- Ruler/compass for drawing areas
- Magnetic field simulation app (e.g., PhET)
|
Introduction:
Begin with a quick demonstration of a bar magnet and iron filings to visualise field lines, linking to prior knowledge of magnetic fields. Ask students to recall how field strength is measured and how area influences flux. Explain that today they will define magnetic flux as B × A cosθ and will be able to calculate it.
|
Lesson Structure:
- Do‑Now (5'): Students answer a short question on magnetic field units on the board (check for prior knowledge).
- Mini‑lecture (10'): Define magnetic flux, introduce Φ = B A cosθ, discuss symbols and units (teacher‑led).
- Guided example (10'): Work through the circular coil calculation; students follow on worksheet (guided practice).
- Interactive demo (8'): Use a simulation to vary θ and observe flux changes; students record observations (hands‑on).
- Group activity (12'): Teams calculate flux for a rectangular area at different angles and present results (collaborative).
- Quick formative quiz (5'): Exit ticket with one flux problem to assess understanding.
|
Conclusion:
Summarise that magnetic flux quantifies how much magnetic field passes through a surface and depends on B, area, and angle. Collect the exit tickets to gauge understanding. Assign homework: complete a worksheet with three flux calculations involving different geometries.
|