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Calibrating instruments…
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A changing magnetic flux makes electricity — Faraday's and Lenz's laws, by hand.
The idea that runs every generator and transformer: move a magnet near a coil and a current appears, from nothing but a changing magnetic flux. These simulations let you push a magnet through a coil and watch the induced EMF flip with the motion, slide a rod along rails to generate ε = BLv, drop a magnet down a copper tube to feel Lenz's braking, and couple two coils to see mutual inductance — every EMF read straight off ε = −dΦ/dt.
Beyond the open showcase, subscribed schools get the growing library of Electromagnetic Induction experiments — searchable, tagged by concept and difficulty, and expanding continuously.