Answers Summer School LA-Biology CRThe Musculoskeletal and Integumentary Systems

Magnets and Magnetism Answers

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Jolie builds a model of a maglev train. She uses disc magnets to levitate the train. A disc magnet has its north and south poles on its faces, as shown.

flat, so that the north pole of each magnet on the train points up and the north pole of each magnet on the track points up

flat, so that the north pole of the magnets on the train point up and the north poles of the magnets on the track point down

on edge, so that the north poles of the magnets on the train point to the front and the north poles of the magnets on the track point toward the rear

on edge, so that the north pole of each magnet on the train and on the track point toward the rear of the train

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Which element is magnetic?

calcium

copper

carbon

cobalt

The diagram shows the field lines near the poles, X and Y, of two magnets.

X: northY: south

X: southY: north

X: northY: north

X: southY: south

A compass taken to Earth’s moon does not point in a specific direction on the moon. What is the most likely reason for the difference between how the compass works on Earth and on the moon?

The moon lacks an atmosphere.

The moon contains no rocks that have iron.

The moon does not have a strong magnetic field.

The moon has no bodies of water.

Which statement about Earth’s core helps explain Earth’s magnetic field?

Earth’s core is composed of magnets.

Earth’s core is composed of iron and nickel.

The outer core is solid.

The inner core is liquid and moving.

A bar magnet and a second object are hung from metal rods. The diagram below shows what happens when both objects are released.

an iron bar

a steel bar

a bar magnet with its north pole on the left

a bar magnet with its south pole on the left

Mateo drew the field lines around the ends of two bar magnets but forgot to label the direction of the lines with arrows.

left

right

down

Jill uses a magnet to pick up a nail. Then, she touches the nail to a paper clip and picks up the paper clip. What will most likely happen when she pulls the magnet away from the nail?

The paper clip will stay attached to the nail because the nail is now a permanent magnet.

The paper clip will stay attached to the nail because the paper clip is now a permanent magnet.

The paper clip will fall off of the nail because the nail was only a temporary magnet.

The paper clip will fall off of the nail because the nail is now magnetized in the opposite direction.

Which best describes Earth’s magnetic field lines?

The field lines go out of Earth at the geographic South Pole and enter Earth at the geographic North Pole in the area where the magnetic pole aligns with the geographic pole.

The field lines go out of Earth near the geographic South Pole and enter Earth near the geographic North Pole in an area where the magnetic pole does not align with the geographic pole.

The field lines go out of Earth at the geographic North Pole and enter Earth at the geographic South Pole in the area where the magnetic pole aligns with the geographic pole.

The field lines go out of Earth near the geographic North Pole and enter Earth near the geographic South Pole in an area where the magnetic pole does not align with the geographic pole.

Laticia draws the diagram below to show Earth’s magnetic field.

The dashed line should be drawn in the same place as the solid line.

The solid line should be drawn in the same place as the dashed line.

The arrows to the left of Earth should point down.

The arrows to the right of Earth should point up.

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Magnets and Magnetism Answers

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