Magnetism and Electricity

An object can become electrically charged if it gains or loses which particles?

• volts

• neutrons

• atoms

• electrons

Will has a long piece of copper wire. He shapes the wire into a coil. What could Will do to cause electric current to flow through the wire?

• shake the wire quickly

• put the wire in hot water

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

• connect the two ends to complete the circuit

What are 2 ways an electromagnet be strengthened?

• moving the iron core and less voltage

• less coils and less voltage

• more coils of wire and more voltage

• faster moving magnet and more voltage

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

• transformer

• motor

• generator

• electromagnet

How are powerful electromagnets used in a junkyeard?

• It could light up at night for workers to see.

• Provide a voltage source for old electronic equipment.

• It could convert electrical energy into mechanical energy.

• It could move heavy objects made of iron.

Which one 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

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Jill 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 class that the north poles of two magnets will repel each other. How can she explain this phenomenon?

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

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

• The Earth's magnetic poles may have reversed positions while Jill 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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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

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

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

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

• ferromagnetic

• magnetic field

• domain

• magnetic pole

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Which of these statements best describes electric charge?

• a high-voltage material that can cause damage to objects

• a fundamental property that causes electric and magnetic interactions

• a force that causes objects to heat up

• a particle that moves freely through matter and causes static electricity to build up on objects

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