Electromagnetic Induction & AC Lab
Switch between motion, flux-linkage, Lenz-direction, and generator-waveform views to connect change, e.m.f., and direction.
Learning goals
- Use magnetic flux and flux-linkage relationships.
- Apply Faraday's and Lenz's laws to induced e.m.f. and direction.
- Explain simple applications of electromagnetic induction, including motional e.m.f. and eddy currents.
- Explain simple iron-core transformer operation and apply ideal transformer ratios.
Welcome back
Continue your saved run?
Your progress is ready.
Case 0 / 6
Score 0 / 0
00:00
Session not started yet. Choose a mode and press Start Session.
Loading the interactive model…The interactive model did not load. Try again reloads this page; the explanation and worked content here are still available.
Change one variable at a time and watch the model respond.
Lab setup
Motion and direction controls
Practice run
Choose a mode and checkpoint count when you want scoring.
Choose your checkpoint count for guided or challenge mode.
Observation logCompare what changed0 saved
Change one variable, save another reading, then compare the evidence.
Scroll sideways to compare readings.
Fair-test check
Study lensApply ε = Bℓv only when the conductor, velocity, and magnetic field satisfy the stated geometry.
Try this
Start with the physical setup: use q(v × B) for motional e.m.f.; use changing flux linkage and Lenz's law for a circuit.
Learn to
- Apply ε = Bℓv only when the conductor, velocity, and magnetic field satisfy the stated geometry.
- Decide when a coil has an induced e.m.f. by checking whether its flux linkage changes with time.
- Use Lenz's law as an opposition-to-change argument, not as an isolated direction mnemonic.
Exam transfer
Governing idea
For mutually perpendicular B, ℓ, and v, motional e.m.f. is ε = Bℓv; a coil follows ε = −N dΦ/dt, and a sinusoid has Vᵣₘₛ = V₀/√2.
Model boundary
The straight-conductor model assumes B, conductor length ℓ, and velocity v are mutually perpendicular. Fields are uniform, rotation is steady, and waveforms are ideal sinusoids; resistance and losses are simplified.
Avoid this trap
Induction requires changing flux linkage, not merely the presence of magnetic flux. Peak and rms values are also not interchangeable.
How to explore
Connect perpendicular conductor motion, flux linkage, Faraday-Lenz reasoning, and sinusoidal generator output.
Predict the outcome, change one variable at a time, then interpret the result. Completion records participation only and does not award mastery.
About this activity
Switch between motion, flux-linkage, Lenz-direction, and generator-waveform views to connect change, e.m.f., and direction. A text explanation and no-JavaScript route remain available.
How this activity affects progress
Course and syllabus information
- Course
- GCE A-Level H2 Physics
- Edition
- GCE A-Level H2 Physics 2027