A magnetic field is created by a charged particle that is
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balanced.
motionless.
moving.
unbalanced.
moving.
The students in Mr. Jones' class designed their own electromagnetic with a copper wire, a D battery, and a large iron nail. All of the students were excited that their large nail was able to pick up approximately 18 small nails. How can you change the design of the experiment in order for the students to be able to pick up MORE small nails?
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Use fewer turns of copper wire and a C battery
Use a lower voltage battery
Use a larger nail
Use a higher voltage battery
Use a higher voltage battery.
hile experimenting with electromagnets, students oriented two like you see in the diagram here. Predict what will happen and explain why.
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The two electromagnets will repel; the poles repel.
The two electromagnets will attract; opposite poles attract.
Nothing will happen; electromagnets do not behave like typical bar magnets.
The two electromagnets will repel; the electrical current forces them away from each other.
The two electromagnets will repel; the poles repel.
Which group of objects would most likely be categorized as conductors?
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Rubber boots, firewood, iron nails
Rubber boots, firewood, paper
Iron nails, copper wire, a gold ring
Iron nails, copper wire, paper
Iron nails, copper wire, a gold ring.
The force of repulsion between two like-charged particles will INCREASE if
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the strength of the charge on both the particles is decreased.
the distance between the charged particles is increased.
the distance between the charged particles is decreased.
the strength of the charge on one of the particles is decreased.
the distance between the charged particles is decreased.
How is an electromagnet different from a bar magnet?
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Bar magnets have a north and south pole, but electromagnets do not.
Electromagnets are only magnetized when a current flows through a wire wrapped around the core.
Bar magnets are attracted to ferromagnetic substances such as iron. Electromagnets are attracted to all metals.
Electromagnets are strong, permanent magnets, but bar magnets are always weaker