Electricity and Magnetism

Which of the following is the most appropriate definition for magnetism?

• the force of attraction or repulsion of magnetic materials

• the force of attraction only of magnetic materials

• the force of repulsion only of magnetic materials

• none of the above

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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If placed in a magnetic field, which of the following materials would be affected?

• a compass

• wood chips

• plastic paper clips

• pieces of glass

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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.

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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

How is the device above different from an electric motor?

• Electric motors turn mechanical energy into electrical energy.

• Electric motors turn electrical energy into mechanical energy.

• Electric motors turn chemical energy into mechanical energy.

• Electric motors turn mechanical energy into chemical energy.

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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

Turbines are huge wheels in power plants that rotate when pushed by water, wind, or steam. How do turbines affect generators?

• They rotate the magnets.

• They directly turn on the light bulb.

• They produce gasoline.

• None of the above

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