Electric and Magnetic Fields

What is a way in which gravitational fields, electric fields, and magnetic fields are all alike?

• They affect only charged objects.

• They affect only objects that contain iron.

• Their effect weakens as the combined mass of the objects increases.

• Their effect weakens as the distance between the objects increases.

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Two aluminum balls are 5 cm apart. One is negatively charged, and the other is positively charged. A small magnet is placed between the two balls but is not touching either of them. The aluminum balls remain stationary. Which statement describes the electric and magnetic fields?

• There is a magnetic field due to the magnet and no electric field.

• There is a magnetic field between the two balls and no electric field.

• There is an electric field between the two balls and no magnetic field.

• There is an electric field around each ball and a magnetic field due to the magnet.

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The diagram shows the magnetic field surrounding a magnet.

Where is the magnetic force the strongest?

• position A

• position B

• position C

• position D

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Which forces can be either attractive or repulsive?

• electrical but not gravitational or magnetic

• gravitational but not magnetic or electrical

• magnetic and electrical but not gravitational

• electrical and gravitational but not magnetic

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Which of these best describes a magnetic field?

• a measure of the length of a magnet

• the force that pushes two magnets away from each other

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

• a region around a magnet in which magnetic forces can affect magnetic objects

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Stephan claims that Earth has both a gravitational field and a magnetic field. Which statement best supports his claim?

• Any object will fall to the ground.

• A bar magnet will fall to the ground.

• Any object will fall to the ground, and a compass can be used for navigation.

• A compass points in the direction of both the magnetic and gravitational fields.

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A student is brushing her hair. As the hairbrush is brought near her head, the hair seems to reach toward the hairbrush. Which of the following is the best explanation?

• Two electric fields are interacting.

• Two magnetic fields are interacting.

• Two gravitational fields are interacting.

• Two electromagnetic fields are interacting.

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