| Lesson Plan |
| Grade: |
Date: 25/02/2026 |
| Subject: Physics |
| Lesson Topic: recall and use E = ∆V / ∆d to calculate the field strength of the uniform field between charged parallel plates |
Learning Objective/s:
- Recall the relationship E = ΔV/Δd for a uniform electric field between parallel plates.
- Explain how potential difference and plate separation determine the magnitude and direction of the field.
- Apply the formula to calculate field strength or potential difference in numerical problems, including correct unit conversion.
- Identify common errors such as forgetting to convert distances or ignoring field direction.
- Interpret diagrammatic representations of uniform fields between charged plates.
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Materials Needed:
- Projector or interactive whiteboard for slides/diagram.
- Printed worksheet with practice questions.
- Parallel‑plate capacitor models or a simulation (e.g., PhET).
- Calculator (or calculator app) for unit conversions.
- Ruler or measuring tape for distance demonstrations (optional).
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Introduction:
Begin with a quick demonstration of two charged plates and ask students what they expect the field to look like. Review the concepts of electric potential and distance from previous lessons. State that by the end of the lesson they will be able to calculate the uniform field strength using E = ΔV/Δd and justify the field direction. Success will be shown through correct answers to practice problems.
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Lesson Structure:
- Do‑now (5'): Students solve a short conversion problem (cm → m) on the board.
- Mini‑lecture (10'): Derive E = ΔV/Δd using work‑energy reasoning and emphasise field direction.
- Guided example (8'): Work through the 5 cm, 250 V example, highlighting unit handling.
- Interactive simulation (7'): Use PhET or physical models to vary ΔV and Δd and observe changes in E.
- Independent practice (12'): Students complete three practice questions, checking answers with peers.
- Check for understanding (5'): Quick exit‑ticket problem calculating ΔV from given E and d.
- Summary discussion (3'): Recap key points and address common mistakes.
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Conclusion:
Summarise that the field magnitude is directly proportional to the potential difference and inversely proportional to the plate separation, and that correct unit conversion is essential. Collect the exit tickets to gauge understanding and assign a short homework worksheet with two new calculations. Remind students to review the diagram of field lines for the next lesson on capacitors.
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