HMH Unit 2 Lesson 2

Why would the attractive force between two magnets increase?

• The like poles of the magnets are pointed at each other and move farther apart.

• The like poles of the magnets are pointed at each other and move closer together.

• The unlike poles of the magnets are pointed at each other and move farther apart.

• The unlike poles of the magnets are pointed at each other and move closer together.

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Which of these determines if a magnet is magnetic or not?

• The density of the material.

• The weight of the material on Earth.

• The alignment of the atoms in the material.

• the number of elements that make up the material

Which of these observations supports that all magnets have two poles?

• Iron is attracted to a magnet but not to other pieces of iron.

• When a bar magnet is cut in half, each half has a north pole and a south pole.

• The north pole of a compass needle is attracted to the south pole of a bar magnet.

• The strength of the magnetic force from a bar magnet decreases as the magnet is pulled away from another object.

Which one is the best definition of electromagnetism?

• the appearance in nature of objects that have both electric and magnetic fields

• the interaction of electricity and magnetism

• the use of electrical energy to produce magnets

• the use of magnets to generate electric current

We made an electromagnet in class by wrapping a wire around an iron core and connecting the wire to a battery. What would have happened if we hooked it up to a really big battery and increased the current flowing through the wire?

• It would increase the flow of electricity in the iron bar.

• It would make the magnetic field of the magnet weaker.

• It would decrease the flow of electricity in the iron bar.

• It would make the magnetic field of the magnet stronger.

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Which answer describes how electromagnetism is used in an electric generator?

• Moving a magnet in a coil of wire generates an electric current.

• Moving a magnet in a coil of wire produces visible light.

• Magnets detect the presence of electric currents in nature.

• Magnets convert electric energy into mechanical energy.

If I were to create an electromagnet but used a compass instead of a nail in the solenoid, what would happen when an electric charge flows through the wire?

• The voltage from the battery would decrease.

• The compass needle would become demagnetized.

• The compass would become electrically charged

• The magnetic field in the coiled wire would become concentrated

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If I were to give you 3 unmarked magnets and a box of paperclips and hooked weights, how could you use the paperclips and weights to compare the strength of the magnets?

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1)If you created an electromagnet but didn't have any iron nails and I gave you an ALUMINUM nail instead, what do you think would happen?

2)What other core materials could be used to create an electromagnet besides iron?

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Vikki wraps a wire around a plastic tube and connects the ends of the wires to a device that measures electric current. When she slides a bar magnet through the tube, north pole first, she sees that a small amount of electric current is produced in the wire. She slides three more bar magnets through the tube north pole first, and a small amount of electric current is produced in the wire each time.

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Predict how the current will change if Vikki slides the bar magnets through the tube south pole first.

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