Quiz: Magnetic field
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What is the source of the magnetic field?
Yes!
Wrong answer. Moving electrons are sources of magnetic fields. Already existing magnetic fields influence moving electrons, but they are not the source of new magnetic fields.
Wrong answer. Moving electrons are sources of magnetic fields. That is what we wrote about lone electrons: Electrons move constantly inside the atom. And as they move, they create a magnetic field. If electrons move constantly in atoms, then why aren't all substances magnetic? Because usually electrons around atoms "fly" in pairs - one in either direction, suppressing each other's magnetic properties.
But atoms of iron, cobalt, nickel, and some other substances have electrons without a pair, with no one to suppress their magnetic field. Such lone electrons also turn the atom itself into a magnet.

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The directions of Earth's geographical poles and magnetic poles are...
Yes!
But every compass has a secret. Compasses for the Northern Hemisphere, for example, where the red arrow should point north, in fact, absolutely always point to the magnetic south of the Earth!
The thing is that near the geographic North Pole of the Earth the magnetic field lines actually enter the planet, i.e. in terms of physics there is the magnetic south, and at the geographic South Pole of the Earth - the magnetic north, as the lines come out of the Earth there. But for convenience, people still decided to call the pole at the North Pole "north" and the pole at the South Pole "south".

Wrong!
But every compass has a secret. Compasses for the Northern Hemisphere, for example, where the red arrow should point north, in fact, absolutely always point to the magnetic south of the Earth!
The thing is that near the geographic North Pole of the Earth the magnetic field lines actually enter the planet, i.e. in terms of physics there is the magnetic south, and at the geographic South Pole of the Earth - the magnetic north, as the lines come out of the Earth there. But for convenience, people still decided to call the pole at the North Pole "north" and the pole at the South Pole "south".
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Dynamo effect...
Wrong! The dynamo itself does not create the Earth's magnetic field but strengthens and maintains the existing one.
Right! The dynamo itself does not create the Earth's magnetic field but strengthens and maintains the existing one.
Wrong! The dynamo itself does not create the Earth's magnetic field but strengthens and maintains the existing one.
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