Exploring Faraday’s Law | Visualising Induced EMF

Watch Faraday’s Law come to life with one of the most powerful demonstrations in electromagnetism. In this video, we explore electromagnetic induction using a falling magnet, induction coil, and oscilloscope to visualise how changing magnetic flux generates voltage in real time. Designed for physics teachers, lab technicians, demonstrators, and physics educators, this practical experiment is ideal for introducing Faraday’s Law and Lenz’s Law in a clear, quantitative, and highly visual way. Whether you’re looking to improve your own practical skills, refresh an A-Level or undergraduate electromagnetism demo, or bring more engaging experiments into the laboratory or classroom, this setup provides a rich investigation into induced emf, magnetic flux, coil turns, signal polarity, and data analysis. Chapters: 00:00 Intro 00:39 Faraday's Law Equipment set up 01:43 Oscilloscope set up 03:58 Signal capture 04:15 Understanding the flip in polarity of the signal 06:23 Effect of varying N, the number of turns in the coil 07:51 Effect of varying dPhi/dt, the rate of change of magnetic flux 10:00 Understanding signal asymmetry 10:42 Wrap up Topics covered: • Faraday’s Law of Electromagnetic Induction • Lenz’s Law and polarity reversal • Using an oscilloscope to capture transient signals • Understanding magnetic flux and dΦ/dt • Effect of coil turns on induced emf • Effect of magnet velocity on induced voltage • Signal asymmetry and flux conservation • Practical setup tips for teaching laboratories • Quantitative analysis for advanced physics courses Featured experiment: A magnet falling through a coil connected to a digital storage oscilloscope, allowing the induced voltage waveform to be observed and analysed in real time. Ideal for: • A-Level Physics • IB Physics • AP Physics • Undergraduate electromagnetism labs • Physics practical demonstrations • Teacher CPD and technician training Equation featured: ε = −N(dΦ/dt) If you found this video useful, please like, comment, and subscribe for more advanced physics practicals, demonstrations, and teaching support. We keep the Physics coming… subscribe so you don’t miss out. Faraday's Law Apparatus: https://lascells.com/product/faradays-law-apparatus/ ----------------------------------------------- Exciting New Products: https://lascells.com/product-category/new/ ----------------------------------------------- Instagram: https://www.instagram.com/lascellsscience/ ----------------------------------------------- Twitter | X: https://twitter.com/lascells ----------------------------------------------- Facebook: https://www.facebook.com/Lascells ----------------------------------------------- LinkedIn: https://www.linkedin.com/company/lascells -----------------------------------------------