Electricity and Magnetism

The area around the magnet in which its force appears is known as

• Electric current

• Magnetism

• Magnetic field

• Air

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Some materials cannot be attracted to the magnet because they are

• Magnetic material

• Non magnetic material

• Located in the magnetic field

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energy that comes from an electrical circuit

• sound energy

• mechanical energy

• light energy

• electrical energy

How does the electromagnet in the diagram above demonstrate the relationship between magnetism and electricity?

• The wire is wrapped around the iron core, but no electric circuit is present.

• The wire is wrapped around the iron core, but no energy source is present.

• The wire in the electric circuit is wrapped around an iron core producing a magnetic field.

• No circuit is present.

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Which of the following is flowing through the electromagnet above?

• electric current

• magnetic current

• magnetic energy

• chemical energy

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In order for the electromagnet above to lose its magnetism, which of the following must occur?

• The wire of the circuit must be tightened.

• The battery in the circuit must be switched for a different brand.

• The electric current must stop flowing in the circuit.

• No circuit is present.

What energy transformation occurs in this device?

• electrical energy to mechanical energy

• chemical energy to mechanical energy

• mechanical energy to chemical energy

• mechanical energy to electrical energy

Which of the following is the best description of a generator?

• A generator produces an electric current when a coil of wire wrapped around an insulator is rotated near a battery.

• A generator produces an electric current when a coil of wire wrapped around an iron core is rotated near a magnet.

• A generator produces an electric current when a coil of wire wrapped around an iron core is rotated near another iron core.

• None of the above

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What purpose do magnets serve in an electric motor?

• The magnets serve as a source of energy for the motor.

• The magnets change the flow of the electric current.

• The magnets cause the coil to rotate by their poles attracting and repelling.

• The magnets are not a necessary part of a motor.

Which of the following is the most appropriate definition for magnetic field?

• an area surrounding a magnet that does not apply a force (a push or pull)

• an area directly on the magnet that applies a force (a push or pull) without actually touching an object

• an area of magnetism surrounding a magnet that applies a force (a push or pull) without actually touching an object

• an area surrounding a magnet that applies a force (a push or pull), but only by directly touching an object

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