AnswersELPGEQ2 MJ Science 3 - 2002100 HCPS v24Magnets and Magnetism

Magnets and Magnetism Answers

10 verified answers
1
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Which statement about Earth’s core helps explain Earth’s magnetic field?

A
Earth’s core is composed of magnets.
B
Earth’s core is composed of iron and nickel.
C
The outer core is solid.
D
The inner core is liquid and moving.
2
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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?

A
The moon lacks an atmosphere.
B
The moon contains no rocks that have iron.
C
The moon does not have a strong magnetic field.
D
The moon has no bodies of water.
3

Two bar magnets are hung from metal rods and held in the position shown below. The magnets are released and swing freely. Which diagram best predicts their final position?

Question illustration
A
A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The magnets are both hanging to the left.
Option A
B
A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The left magnet hangs to the left. The right magnet hangs to the right.
Option B
C
A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The left magnet hangs to the right. The right magnet hangs to the left.
Option C
D
A rectangular box with 2 black lines running down from it, each to a horizontal bar magnet labeled N to the left and S to the right. There is a gap between the magnets. The left magnet hangs straight down. The right magnet hangs to the right.
Option D
4

Which best describes Earth’s magnetic field lines?

A
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.
B
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.
C
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.
D
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.
5

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?

A
The paper clip will stay attached to the nail because the nail is now a permanent magnet.
B
The paper clip will stay attached to the nail because the paper clip is now a permanent magnet.
C
The paper clip will fall off of the nail because the nail was only a temporary magnet.
D
The paper clip will fall off of the nail because the nail is now magnetized in the opposite direction.
6

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

Question illustration
A
The dashed line should be drawn in the same place as the solid line.
B
The solid line should be drawn in the same place as the dashed line.
C
The arrows to the left of Earth should point down.
D
The arrows to the right of Earth should point up.
7

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.

Question illustration
A
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
B
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
C
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
D
on edge, so that the north pole of each magnet on the train and on the track point toward the rear of the train
8

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

Question illustration
A
left
B
right
C
up
D
down
9

Which refers to the ends of a magnet where the forces are strongest?

A
attracting forces
B
opposing forces
C
magnetic fields
D
magnetic poles
10

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

Question illustration
A
X: northY: south
B
X: southY: north
C
X: northY: north
D
X: southY: south

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