Magnetism and Its Uses

A device that increases or decreases voltage in a power line is called a

• transformer.

• motor.

• generator.

• commutator.

A magnetic force surrounds

• all moving charged particles.

• only particles that move in a magnetic wire.

• all charged particles that stay in a fixed position.

• only charged particles that move in a straight line.

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An electric motor produces motion when

• an electromagnet's poles stop reversing.

• a permanent magnet's poles are reversed.

• a current flows from the magnets to the battery.

• an electromagnet spins between the poles of permanent magnets.

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Which would result in an increase in the attractive force between two magnets?

• The north poles of two magnets move closer together.

• The south poles of two magnets move away from one another.

• The north pole of one magnet moves closer to the south pole another a magnet.

• The north pole of one magnet moves away from the south pole of another magnet.

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A magnet that quickly loses its magnetism after being removed from a magnetic field is a(n)

• temporary magnet.

• electromagnet.

• permanent magnet.

• ferromagnetic elements.

A(n) _____ consists of a core magnetized by a current-carrying wire coil that surrounds it.

• temporary magnet.

• electromagnet.

• ferromagnetic elements.

• permanent magnet.

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_____ are materials such as iron and nickel that have an especially strong attraction to magnets.

• Temporary magnet

• Electromagnet

• Ferromagnetic elements

• Permanent magnet

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A magnet that retains its magnetism after being removed from a magnetic field is called a(n)

• temporary magnet.

• electromagnet.

• ferromagnetic elements.

• permanent magnet.

Generators in power plants are typically connected to a(n) ______________, which is a shaft with a set of blades.

• tranformer

• electromagnet

• turbine

• permanent magnet

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Which structure in the diagram is the power plant?

• a

• b

• c

• d