Magnetism · Physics

Faraday's Law Simulation

Push a bar magnet through a coil and light a bulb. Faster motion, more loops and a stronger magnet give a bigger EMF; reverse the motion and the current reverses.

Interactive virtual lab · no download · works on phones and laptops

Chapter: Electromagnetic Induction
For: Class 10 · Class 12 · JEE · NEET
Time: ~12 min

Faraday's Law is a Pro simulation

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How to use it

1Drag the magnet through the coil — or switch on auto motion.
2Change the number of loops and the magnet strength.
3Switch between the bulb and the voltmeter.
4Transformer tab: drive the primary with AC and change the turns.

What to notice

EMF appears only while the flux is changing: ε = −N dΦ/dt.
A stationary magnet inside the coil induces nothing.
The induced current opposes the change (Lenz's law), so its sign flips with direction.
A transformer steps voltage in the ratio of turns: Vs/Vp = Ns/Np.

For teachers

A ready-made teaching kit comes with this lab

Lesson plan
21 min, 4 steps
Ask the class
3 questions with answers
Quick quiz
7 questions, printable
Key formulas
2 formulas

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About the Faraday's Law simulation

Faraday's law: a changing magnetic flux through a coil induces an EMF proportional to the rate of change and to the number of turns. A magnet held still inside a coil does nothing; only motion — or a changing current in a nearby coil — makes a current flow. Lenz's law gives the direction: the induced current opposes the change that made it.

In this Faraday's law simulation you push a magnet through one or two coils and watch a bulb or voltmeter respond, then switch to a transformer and change the primary and secondary turns. It covers Electromagnetic Induction and Alternating Current in Class 12 and Magnetic Effects of Current in Class 10, JEE and NEET.

Also covers: electromagnetic induction, induced emf, lenz's law, pickup coil, transformer, flux.