Magnetism – Flashcards
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The source of all magnetism is?
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moving electric charges.
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Moving electric charges will interact with?
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an electric field, a magnetic field.
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An iron rod becomes magnetic when?
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the net spins of its electrons point in the same direction.
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Surrounding every moving electron is?
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a magnetic field, and electric field.
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Magnetism is due to the motion of electrons as they?
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move around the nucleus, spin on their axes.
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If the North Pole of one magnet is brought near the South Pole of another magnet, the poles will?
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attract each other.
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If you break a bar magnet in half, each half?
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becomes a bar magnet with two poles.
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If you put a small compass in a magnetic field, the compass will?
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line up in a direction perpendicular to the magnetic field lines.
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Magnetic field strength is?
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strongest close to a magnet.
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Magnetic fields are produced by?
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moving charged particles.
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Magnetic domains are?
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regions of atoms magnetically alligned.
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Permanent magnet can be made by?
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Stroking material containing iron with a magnet, placing a piece of iron in the strong magnetic field, placing a piece of iron near a strong electromagnet.
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The reason a magnet can attract an unmagnetized nails is that?
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nails become temporarily magnetized in a magnetic field.
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When current passes through a wire, a magnetic field is created around the wire only if the?
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Nonesense! A magnetic field is always created around the wire.
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A wire carrying a current is bent into a loop. The magnetic field is strongest _________?
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at the center of the loop.
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In order to make an electromagnet, you need a?
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battery, some wire, and a nail.
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A galvanometer can also be made into?
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an ammeter, a voltmeter.
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Loops of wire in a motor rotate because a?
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magnetic field exerts forces on moving electrons in the loop.
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The magnetic pole in the Northern hemisphere is located?
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in Canada.
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The earths magnetic field is the most likely due to?
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convection currents in the molten pet of the earths interior.
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The earths magnetic field reverses it's polarity about once every?
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million years.
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The force on an electron moving in a magnetic field will be the larges when its direction?
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is the same as the magnetic field direction.
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The intensive of cosmetic rays bombarding the earths surface is the largest at the?
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poles.
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Which geographic pole of the earth is nearest the magnetic North Pole of the earth?
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South Pole.
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Which pole of a compass needle points to a South Pole of a magnet?
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North Pole.
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If a compass is moved from the northern hemisphere to the Southern Hemisphere, its magnetic needle will change direction?
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not at all.
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Magnetic field lines surrounding a magnet are conventionally drawn?
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from north to south.
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Which force field can increase a moving electrons speed?
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Electric field
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Which force field can accelerate an electron, but never change its speed?
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Magnetic field.
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Magnetic poles are similar to electric charges in that they both can repel and attract one another.
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True
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Because magnetism is slightly different from electrostatics, magnetic fields do not exist.
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False.
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Just as it is easy to separate electric charges, it is relatively easy to isolate a magnetic monopole.
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False.
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A magnetic field is produced by the motion of charged particles.
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True.
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Spinning electrons themselves are small magnets.
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True
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Magnetic domains are regions in a material where clusters of atoms are randomly magnetized.
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False
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The magnetic fields lines around a wire carrying a current from a series of concentric circles.
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True
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A neutron that moves at right angles to a magnetic field experiences a force.
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False
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A current-carrying wire feels a force when the wire is perpendicular to a magnetic field.
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True
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A galvanometer is an instrument that detects gravitational waves.
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False
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It is possible to make a motor out of a a loop of wire, a magnet, some contacts, and a dry cell.
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True
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The magnetic pole in the northern hemisphere is located at the geographic North Pole.
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False
