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20 QUESTIONS · 5 TOPICS · FIELD-LINE EXPLORER · ABOUT 15 MINUTES

Electricity and magnetism are one force. Light is what happens when it ripples.

In 1865 James Clerk Maxwell's equations predicted waves of electric and magnetic field travelling at exactly the speed of light. Twenty questions on charge, fields, circuits, magnets and waves, each explained, then place two charges and see the field they make. No sign-up, nothing saved.

Start the test
MAXWELL'S EQUATIONS, IN WORDS
Gauss's lawElectric charges are the sources of electric fields.
No magnetic monopolesMagnetic field lines always form closed loops.
Faraday's lawA changing magnetic field creates an electric field.
Ampère–Maxwell lawCurrents and changing electric fields create magnetic fields.
QUESTION 1 / 20 · CHARGEEasy

Rubbing a balloon on your hair makes it stick to a wall because…

FIELD EXPLORER

Two charges, one invisible field

Each arrow shows which way a small positive test charge would be pushed at that point, and its brightness shows how strongly. Change the charges and the gap between them.

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COULOMB FORCE ON EACH CHARGE9.99 NAttractive: they pull together
Field lines leave the positive charge and end on the negative one. Halve the gap and the force grows four times.
Charges in microcoulombs (μC), separation in centimetres. F = k q₁q₂ / r², with k ≈ 8.99 × 10⁹ N·m²/C². Yellow arrows show the force on each charge; equal and opposite, as Newton's third law requires.

What this electromagnetism test covers, in short

Twenty multiple-choice questions at first-year university level, four on each of five topics: electric charge, electric fields and potential, circuits, magnetism and induction, and electromagnetic waves.

For basic circuits and Ohm's law, the general physics test is a gentler start. The test is our own and not normed.

By What's Your IQ · Reviewed 5 Oct 2026
Format
20 multiple-choice questions
Level
First-year university
Bonus
Two-charge field and force explorer
Founding work
Maxwell, A Dynamical Theory of the Electromagnetic Field (1865)

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