Investigate induction on three 3D practical benches: move a magnet through a coil, measure flux against angle and run an AC generator with live graphs and saved comparisons.
What you can investigate
- Why an emf appears only while magnetic flux linkage is changing
- How Lenz’s law makes a coil repel an approaching magnet and attract a retreating magnet
- How magnet speed and number of turns affect the modelled induced emf
- How coil orientation and projected area determine magnetic flux linkage
- Why rotating-coil flux linkage and induced emf are a quarter-cycle apart
- How field strength, turns, area and rotation frequency set peak generator emf
Try these investigations
- Predict whether the coil repels, attracts or has no effect on a moving magnet.
- Reverse the magnet pole and motion separately and explain what reverses and what stays the same.
- Compare slow and fast motion, then change the number of turns.
- Scrub one coil rotation and identify where flux linkage and induced emf are zero or maximum.
- Double B, N or f and predict the new peak generator emf.
Revision and practice