Lenz’s Law Demonstrator – Open & Closed Loop (KS4+)

This Lenz’s Law Demonstrator is an excellent hands‑on resource for teaching Faraday’s Law of Electromagnetic Induction and Lenz’s Law at KS4 and above. The apparatus clearly illustrates how the presence or absence of a complete electrical loop affects the induced current and resulting motion.

When a magnet is passed through the closed conducting loop, an induced current is produced, generating a magnetic field that opposes the motion—causing the device to move noticeably. In contrast, passing the magnet through the open (split) loop produces no induced current, resulting in no movement, offering a clear comparison between the two scenarios.

This simple yet powerful demonstration helps students understand fundamental principles of electromagnetism and reinforces the concept of energy conservation.

Key Features

• Demonstrates Faraday’s Law and Lenz’s Law with clarity
• Includes open (split) loop and closed loop for comparison
• Shows how induced current affects motion when a magnet passes through
• No movement occurs in the split loop, highlighting the need for a complete circuit
• Suitable for KS4–KS5 physics
• Ideal for classroom demonstrations and student investigations

Ideal for School Science Lessons

Perfect for GCSE and A‑Level physics, this apparatus supports learning in:

• Electromagnetic induction
• Direction of induced currents
• Relationship between magnet motion and induced EMF
• Practical demonstrations of opposing magnetic fields
• Understanding how energy is transferred and conserved in physical systems

Engaging, visual, and easy to use, this Lenz’s Law demonstrator is an essential tool for teaching key electromagnetic concepts in school science.