PS MS Apex Unit 8 Test Review

Which statement applies only to electric force instead of both electric and magnetic forces?

• It acts between charged particles.

• It can pull objects together.

• It can push objects apart.

• It acts between objects that do not touch.

Which term related to electromagnetism applies only to magnetic force?

• Noncontact

• Protons

• Attraction

• Poles

Which two conditions would result in the strongest electric force between charged objects?

• Objects are close together.

• Objects are insulators with unbalanced charges.

• Objects are far apart.

• Objects are conductors with balanced charges.

Which action would decrease the strength of the attraction between a magnet and an iron object?

• Decreasing the number of electrons on the magnet

• Moving the iron object closer to the magnet

• Moving the magnet farther away from the iron object

• Increasing the number of electrons on the magnet

The arrows on field lines show the direction of force in an electric field.

Which statement best describes how the arrows are shown?

• Arrows point away from both charges

• Arrows point toward both charges

• Arrows point away from the negative charge and toward the positive charge

• Arrows point away from the positive charge and toward the negative charge

Which statement best describes the direction of force shown by the magnetic field lines around a bar magnet?

• Away from both the magnet's north and south poles

• From the magnet's north pole to its south pole

• From the magnet's south pole to its north pole

• Toward both the magnet's north and south poles

The diagram shows an electric generator containing an electromagnet. When the generator is working, what is in the wire?

• Electric current

• Permanent magnets

• Chemical energy

• Small batteries

Which part do both an electric motor and a generator need to work?

• Battery

• Switch

• Electromagnet

• Turbine

Which picture shows an example of magnetic force?

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Which two photos show electric force in action?

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