AnswersELPGEQ2 MJ Science 3 - 2002100 HCPS v24Magnets and Magnetism

Lab: Magnetic and Electric Fields Answers

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Joe follows the procedure below to make a compass.1. Move a magnet from the top of a needle to its point fifty times.2. Lay the needle on a cork that is floating in a bowl of water.3. Observe the direction that the needle points.

A
to give the needle an electric charge
B
to make the needle sharper
C
to magnetize the needle
D
to flatten the side of the needle
2
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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.
3

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.
4

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.
5

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
6

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

Question illustration
A
an iron bar
B
a steel bar
C
a bar magnet with its north pole on the left
D
a bar magnet with its south pole on the left
7

Mr. Garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is

A
iron.
B
carbon.
C
plastic.
D
glass.
8

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.
9

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
10

In an illustration, lines of force are drawn around a magnet to illustrate the magnetic

A
field.
B
induction.
C
poles.
D
force.

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