Physics · Electricity and Magnetism

Faraday's Law

Drag the bar magnet through the coil. Watch the bulb and voltmeter show the induced EMF.

P Physics

See what happens

Magnet and coil

Move the magnet faster for a bigger effect.

Induced EMF 0.00 V

Faraday's Law EMF = −N·dΦ/dt

Loops 4

Explore

Controls

Number of loops

1 2 3 4

Show field lines

With more loops, the same magnet motion induces a larger EMF. A stationary magnet induces no EMF at all.

Faster motion → larger EMF, brighter bulb
More loops → larger EMF for the same motion
No motion → EMF is zero

F Faraday's Law

Simulation menu

Simulation tools

Keyboard help

Tab to the magnet, then use the arrow keys to move it through the coil.

↑↓←→

Move the focused magnet by one step.

Tab/Shift+Tab

Move to the next or previous control.

EnterSpace

Press a focused button, radio option or checkbox.

←→

Change the selected number of loops when the loop group is focused.

R

Reset the simulation after the Reset button is focused.

Esc

Close a menu or window, or leave full screen.

Simulation support

Report an Issue

Tell us what went wrong so the simulation can be improved.

Issue Type *

Simulation not working

Incorrect behaviour/result

UI/display problem

Difficult to use

Other

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Screenshot attachment is not available in V1.

Pandai Simulation

Faraday's Law

Version 0.5.1

See how a moving bar magnet induces an EMF in a coil, and how loop count and speed change the effect.

Created by Pandai to help students learn about electromagnetic induction.

The bar magnet is left of the coil. The coil has 4 loops. Induced EMF is 0.00 volts. The bulb is dark and the voltmeter needle is centred.