Magnetism quiz

More questions about Magnetism

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   Why do cars in neutral seem to roll uphill on magnetic hills?

   Answer: Optical illusion

   Why: A hidden or tilted horizon removes the usual level reference, so a gentle downhill stretch of road looks as if it climbs.

2. 2 Medium

   What animal did scientists float inside a strong magnet in 1997?

   Answer: Frog

   Why: A frog is mostly water, which a strong enough magnet weakly pushes away, so the 16-tesla field could balance its weight.

3. 3 Hard

   How do parallel wires react when electric currents flow the same way?

   Answer: Pull together

   Why: This pull between parallel wires defined the ampere from 1948 until the SI units were redefined in 2019.

4. 4 Easy

   What does an electric current in a nearby wire do to a compass?

   Answer: Turns the needle

   Why: The current wraps the wire in circular magnetic field lines, so the needle swings to lie across the wire rather than point at it.

5. 5 Medium

   What keeps an ordinary iron nail from acting as a magnet?

   Answer: Domains point randomly

   Why: Inside each domain the atoms' tiny magnets already point the same way; magnetizing the nail makes the domains that match the field grow.

6. 6 Hard

   When did Earth's magnetic poles last flip and stay flipped?

   Answer: About 780,000 years ago

   Why: Lava cooling at mid-ocean ridges freezes in the field's direction, so the seafloor holds matching stripes of normal and reversed magnetism.