Assessment-Magnetic Fields (Other Teachers)

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4) Select the best answer for each question.
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NOTE: If your teacher’s last name is Elliott, then you are doing the wrong assessment.
---This assessment is only for students of other teachers.
---If your teacher is Mr. Elliott, then please go back to the website and click on the first assessment link instead. Thanks!

Regardless of the shape, all magnets have a north pole and a south pole. This is called polarity.
Which magnet below is the best example of the magnetic poles of our planet?

Magnets exert force on other magnets. (Opposites attract and like repels)
Which set of horseshoe magnets shown below correctly displays magnetic attraction?

a.		c.
b.		d.

Permanent Magnet	Electromagnet

Permanent magnets and electromagnets have invisible magnetic fields around them.

Which statement best compares a permanent magnet and an electromagnet?

a.	A permanent magnet has a fixed magnetic field strength but the magnetic field strength of an electromagnet can be changed.
b.	A permanent magnet requires an external source of energy, but an electromagnet produces its own energy.
c.	A permanent magnet has a north pole and a south pole, but an electromagnet only has a south pole.
d.	The magnetic field lines from a permanent magnet emerge from the north pole, but they emerge from the south pole of the electromagnet.

Earth’s Magnetic Poles	A Compass
. .	. .

You can use a compass to navigate, and a compass is essentially a thin bar magnet that is able to spin.
Why does the north pole of a compass point towards the geographic north pole of our planet?

a.	Because with magnetic poles, like poles repulse one another.
b.	Because the domains of the bar magnet are aligned creating a gravitation field
c.	Because with magnetic poles, opposites attract.
d.	Because the geographic pole changes every 10, 000 years

Illustration A

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Examine the apparatus shown in the illustration above containing two circular magnets.
Notice that magnet A is levitating above magnet B due to magnetic force.
Which of the following statements correctly describes what is happening in this diagram?

a.	Neither of these circular magnets have poles. This explains why magnet A is levitating.
b.	The polarity of the top of magnet B is the opposite polarity of the bottom of magnet A.
c.	The bottom of magnet A is a north pole, and the bottom of magnet B is also a north pole.
d.	The polarity at the top of magnet B is the same as the polarity at the bottom of magnet A.

Hoverboard Skatepark

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Trevor and Jaxson used their knowledge of magnetic fields to design and build a hoverboard park.
They embedded thousands of bar magnets into the surface of the floor with the north poles facing up.
What would the polarity of the bottom of the hoverboard have to be in order to levitate the board?

a.	Instead of magnets, they could simply mount wheels on the board.
b.	The hoverboard would not need any polarity as long as it was made of aluminum.
c.	The bottom of the hoverboard would have to be a south pole.
d.	The bottom of the hoverboard would have to be a north pole.

Magnets exert force on other magnets. (Opposites attract and like repels)
Which set of magnets correctly demonstrates the attraction of unlike poles?

a.		c.
b.		d.

Horseshoe Magnet

Look at the permanent magnet shown above
Why is the magnet shown above NOT a good model for Earth’s magnetic field?

a.	The Earth’s magnetic poles are on the bottom of the planet like a horseshoe magnet.
b.	Unlike this horseshoe magnet, Earth’s poles are at opposite ends like a bar magnet.
c.	The Earth’s magnetic poles are on the equator like an electromagnet.
d.	The Earth’s geographic poles are the on the equator like a bar magnet

Planet Earth

This representation of Earth is good evidence that our planet has ...?

a.	gravity	c.	an atmosphere
b.	organic compounds	d.	a magnetic field

10.

Diagram 01

Examine the diagram displayed above.
Select the answer that correctly describes the phenomena that is illustrated in this diagram.

a.	This diagram is demonstrating that opposite poles attract and that like poles repel.
b.	A powerful planet-wide electromagnet is being used to pull the Earth closer to the sun.
c.	Charged particles in the solar wind are impacting Earth’s magnetic field.
d.	The Earth’s magnetic poles are switching which occurs every thousand years or so.