Electromagnetic Field Lab

Overview

Students combine virtual simulations and a hands-on electromagnetic setup to investigate how changing magnetic fields produce electric effects and how electromagnetic fields relate to wave behaviour. This lesson continues the unit “Exploring the World of Waves” by linking wave properties to electromagnetic induction and field interactions.

Learning intentions

Students will:

• explain how changing magnetic fields can induce electric effects (electromagnetic induction) using scientific language
• identify and describe relationships between field variables and observable wave/EM outcomes in simulations
• use scientific process to plan a fair investigation and solve a physics problem using evidence from data
• communicate a scientific argument that links observations to a wave-field explanation for a specific audience

Success criteria

• I can describe what happens to an induced effect when magnetic field strength or change rate changes.
• I can compare results from PhET simulations and explain similarities/differences using physics reasoning.
• I can use a method to collect consistent data and justify why it is fair/reliable.
• I can present a clear claim, using evidence and correct terminology (field, induction, electromagnetic wave).

Curriculum links

• Physics 11–12 — Waves: PY-11-02 (students explain properties and behaviours of waves, including how fields produce wave effects)
• Physics 11–12 — Electricity and magnetism: PY-11-03 (students explain electric and magnetic field interactions, including induction and field change)
• Working scientifically: PY-11WS-06 (students use scientific process to solve scientific problems)
• Working scientifically: PY-11WS-07 (students communicate scientific arguments using evidence and terminology)

Lesson structure (45 minutes)

1. 0–5 min · Starter prompt. Teacher displays two scenarios: “magnet held still near a coil” vs “magnet pushed in/out near a coil,” and asks students what differs and why. Students quick-write a prediction and one explanation sentence using words like “field” and “change”.

2. 5–12 min · Safety + setup walkthrough. Teacher demonstrates the hands-on coil + magnet arrangement and how to record readings from a simple sensor/meter (or mapped observations if no sensor is available), then previews the PhET screens. Students rotate sight-read key instructions, check equipment, and confirm their recording table headings.

3. 12–22 min · Simulation investigation (PhET). Teacher runs PhET “Faraday’s Law” focusing on changing magnetic field (strength and rate) and the resulting induced effect; then highlights where “radio waves & electromagnetic fields” shows EM wave generation. Students in pairs set up two controlled trials each: one varying magnet strength, one varying speed of motion, recording outcomes and noting qualitative wave behaviour (e.g., emission/propagation cues).

4. 22–32 min · Hands-on electromagnetic induction test. Teacher sets the task rules: one variable at a time, consistent coil position, timed push/pull, and repeat for reliability. Students conduct two brief trials (e.g., stronger magnet vs weaker magnet; fast vs slow movement) and record evidence (meter/LED/buzzer response, or induced signal strength indicators).

5. 32–40 min · Processing: make the relationship claim. Teacher provides a structured scaffold: “When ___ changes, the induced effect ___, because ___.” Students analyse results and complete a comparison statement between simulation and hands-on data, including one similarity and one possible reason for any difference.

6. 40–45 min · Exit ticket (mini argument). Teacher collects a short response: students answer one prompt—“How does changing magnetic field relate to electromagnetic wave outcomes?” Students submit a 6–8 sentence scientific argument with at least two pieces of evidence and correct terminology.

Resources

• Laptops/tablets with PhET simulations installed or pre-opened: “Faraday’s Law” and “Radio Waves & Electromagnetic Fields”
• Coils/solenoids, magnets (different strengths if available), leads/holders
• Simple induction indicators: multimeters/data loggers OR LED/buzzer indicators OR pre-made coil–sensor demo with response meter
• Stopwatch/timer (phone allowed only if permitted)
• Data recording sheets (table for variable, trial, observation, evidence notes)
• Safety guidance sheet (magnets kept away from eyes, tidy wiring, careful handling)
• Whiteboard/slide with starter scenarios and the argument scaffold

Assessment

• Formative check during the simulation: teacher circulates and listens for correct use of “changing field” and cause–effect reasoning.
• Formative check during hands-on trials: teacher reviews data tables for controlled variables and repetition (at least two trials per condition).
• Exit ticket: evaluate accuracy of the induction-to-field-to-wave explanation and whether evidence is clearly linked to the claim.

Differentiation

• Support: provide sentence starters for the claim-evidence-reasoning scaffold and a word bank (magnetic field, changing, induced, electromagnetic wave, induction).
• Support for data: offer a partially completed table template and allow qualitative evidence labels (low/medium/high) when no quantitative sensor is available.
• Extension: challenge students to predict the outcome if they reversed coil orientation or altered the number of coil turns, then test in simulation (without requiring new hands-on equipment).
• EAL/SEN: pair roles clearly (controller/note-taker), allow extra processing time after teacher demonstrations, and provide simplified checklists for “one variable at a time” and “repeat trials.”