8th Unit 7 Lessons 4-6 Review

Which of the following best describes a magnetic field?

• a measure of the length of a magnet

• the force that pushes two magnets away from each other

• an invisible region that surrounds the north pole of a magnet

• a region around a magnet in which you can measure magnetic forces

Tags

NGSS.MS-PS2-5

Sometimes the north and south poles of atoms in a material will line up. What is the term for the region where this occurs?

• a domain

• feroomagnetic

• magnetic field

• magnetic pole

Tags

NGSS.MS-PS2-5

Amanda is holding a compass and notices that the north pole of the compass points towards the north pole of the Earth. She is confused because she knows from her science classes that the north poles of two magnets will repel each other. How can she explain this phenomenon?

• The geographic north pole of the Earth is actually near the Earth’s magnetic south pole.

• The north pole of the compass was probably pushed in the wrong direction by a nearby magnet.

• The Earth’s magnetic poles may have reversed positions while Amanda was observing the compass.

• The Earth’s poles are not strong enough to attract any handheld magnets, so it was probably a coincidence that the compass pointed towards the north pole.

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Examine the properties of the three magnets in the chart below:

Which of these magnets is most likely a permanent magnet?

• A

• B

• C

• A, B, C

Which of the following determines whether or not a material is magnetic?

• the density of the material

• the weight of the material on Earth

• the alignment of atoms in the material

• the number of elements that make up the material

Tags

NGSS.MS-PS2-3

Which of the following best describes how a powerful electromagnet could be used in a junkyard?

• It could move heavy objects made of iron.

• It could convert electrical energy into mechanical energy.

• It could light up the area so workers can see at night.

• It could provide a voltage source for old electronic equipment.

Tags

NGSS.MS-PS2-5

What is the best word to describe a system in which a magnet moves in a coil of wire to produce electrical energy?

• electromagnet

• generator

• motor

• transformer

Tags

CCSS.RI.6.3

CCSS.RI.6.5

CCSS.RI.7.5

CCSS.RI.8.3

CCSS.RI.8.5

The interaction between electrical energy and magnetism has been an important topic in 20th century science. Which term describes this interaction?

• electromagnetism

• ferromagnetic

• magnetic field

• static electricity

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NGSS.MS-PS2-3

NGSS.MS-PS2-5

Observe the electromagnet below:

An electric current is in the wire. What is the name for this coiled wire that is wrapped around the iron core of the electromagnet?

• generator

• solenoid

• transformer

• trapezoid

Tags

NGSS.MS-PS2-3

Daniel has a long piece of copper wire. He shapes the wire into a coil. What could Daniel do to create an electric current in the wire?

• shake the wire very quickly

• submerge the wire into a pan of hot water

• move a bar magnet in and out of the wire coil

• connect the two free ends of the wire so that they form a closed path

Tags

NGSS.MS-PS2-5