Conceptual Physics-Magnetism Unit-Activities 1 and 2 Quiz

Question 1

Magnetic Domains

Answer 1

Groups of atoms with their magnetic poles lined up (based on how their electrons spin around them)

Question 2

Magnetic domains line up with their blank and blank blanks facing the same direction in magnetized objects.

Answer 2

north and south poles

Question 3

Magnetic domains do not line up in blank blanks.

Answer 3

unmagnetized objects

Question 4

Magnetic objects can be demagnetized by being:

Answer 4

dropped
heated
hit
or otherwise (having their domains) “jumbled”

Question 5

Objects such as pins can become magnetized if

Answer 5

their domains are lined up by a magnet.

Question 6

What is the result of cutting a bar magnet in half?

Answer 6

You end up with two separate magnet, each with their own individual north and south poles.

Question 7

A magnetic field can be created in a wire by

Answer 7

causing current to flow through it.

Question 8

The strength of an electromagnet depends on the blank, blank, and blank.

Answer 8

current
number of loops
type of core

Question 9

Magnetism is caused by

Answer 9

the motion of electrons

Question 10

Magnetic objects are surrounded by

Answer 10

an invisible magnetic field

Question 11

Earth is surrounded by its own

Answer 11

magnetic field

Question 12

Universal Law of Energy… or whatever it is called:

Answer 12

Energy is not created or destroyed, but it can change forms.

Question 13

Like poles…

Answer 13

repel

Question 14

Opposite poles…

Answer 14

attract

Question 15

The strength of a magnetic field includes both

Answer 15

distance and direction

Question 16

The direction of a magnetic field at a specific spot is…

Answer 16

the direction that the north seeking pole of a compass will face if the compass were placed at that location.

Question 17

What happens when a compass (that usually points north) is placed near a magnet or electromagnet?

Answer 17

it is deflected by the magnetic field of either the magnet or electromagnet, so that it (usually) doesn’t point north.

Question 18

Describe what the magnetic field of a bar magnet looks like.

Answer 18

The field will be “pointing” away from the south pole, in a gradual arc to the north pole. IN other words, all the “arrows” in a diagram of the field should go from the south pole towards the north pole.

Question 19

What effect does the electric current have on the wire?

Answer 19

It aligns the domains of the wire, aka magnetizes it.

Question 20

How does the left hand rule work?

Answer 20

If you have a wire going straight in one direction, with current flowing from the negative end to the positive end, and you wrap (or imagine wrapping) your left hand around the wire, so that your thumb is pointing towards the positive end, the direction your fingers are pointing is the direction of the magnetic field around said wire.
So, for example, if the wire was pointing towards you, and the positive end of the wire was in your direction, the magnetic field should be flowing clockwise (from that perspective).

Question 21

The magnetic field of a bar magnet is strongest at the blank(s).

Answer 21

poles

Question 22

The magnetic field of a bar magnet is weakest at the blank(s).

Answer 22

middle

Question 23

As you move away from a magnet, the strength of the field…

Answer 23

weakens

Question 24

A compass is…

Answer 24

A free spinning magnet that aligns itself with the darts magnetic field.

Question 25

If no magnet or electromagnet or large structure made of ferrous material.is nearby, compasses will always point…

Answer 25

north

Question 26

Solenoid

Answer 26

current carrying coil of wire with many loops

Question 27

Electromagnet

Answer 27

A solenoid with a ferromagnetic core (like iron)

Question 28

How is an electromagnet different than a permanent magnet?

Answer 28

An electromagnet is a temporary magnet, a permanent magnet is… permanent.
An electromagnet is requires a power source/current, a permanent doesn’t.
An electromagnet can reverse polarity, but a permanent magnet cannot.
An electromagnet can vary its strength, but a permanent magnet cannot.

Question 29

How can you increase the strength of a solenoid?

Answer 29

Add a better or improve the core
Add more coils or layer the coils
Increase the current

Question 30

How does increasing the number of coils increase the power of an electromagnet?

Answer 30

Increases number of domains

Question 31

How does increasing the current increase the power of an electromagnet?

Answer 31

By aligning the domains better

Question 32

How does the core affect the electromagnet?

Answer 32

It amplifies the fields, if it is ferromagnetic.