Magnetic Fields
Earth as a Magnet
Electromagnets
Wild Card (Random U1-8 Questions)
Wild Card (Random U1-8 Questions)
100

What direction do magnetic field lines point?

a. N -> S

b. S -> N

c. S -> S

d. N -> N

a. N -> S

100

Name the piece of equipment that is used for navigation using the Earth’s magnetic field.

Compass

100

What three factors affect the strength of an electromagnet?

Number of coils, current, type of core
100

What are the three components of blood?

Red blood cells, white blood cells, plasma

100

When a liquid or gas diffuses it moves from an area of _________ to __________ concentration.

High to low concentration

200

What is a magnetic field?

a. An area where you can use a magnet

b. An area where magnetism can be detected

c. An area to store magnets

d. An area where no magnets are allowed

b. An area where magnetism can be detected
200

What part of Earth’s structure is believed to be the cause of Earth’s magnetic field?

The core, because it contains molten iron

200

What is one real-world use of electromagnets?

Used at scrapyards to lift objects made of magnetic metals

Speakers / Headphones

Electric locks

Motors

200

What is one factor that affects solubility?

Temperature

200

When white light passes through a triangular prism it is dispersed (split into components colors). What are the 7 colors it is split into?

ROYGBIV

Red Orange Yellow Green Blue Indigo Violet

300

What 3 metals are magnetic?

Nickel, iron and cobalt

Steel is an alloy or iron, so it is also magnetic

300

True or false:

The Earth magnetic poles are slowly moving at a speed of about 60km each year.

True

300

True or false:

Unlike permanent magents, electromagnets don't have a North and South pole?

False, they have poles just like a permanent magnet

300

When light bends due to changing speed as it goes from one medium to another, this is called...

Refraction
300

Where does gas exchange occur? Be specific, where in the lungs does it occur.

Alveoli (air sacs)

400

Identify all 4 poles on the 2 magnets.

From left to right:

S, N, N, S

400

Where is the Earth's magnetic fields the strongest?

Near the magnetic poles

400

For your practical you investigated how certain factors affect the strength of an electromagnet. What was the dependent variable in the experiment?

The strength of the magnet (how many paperclips it raised)

400

What is the difference between weather and climate?

Weather is the short-term state of the atmosphere. Climate is the long-term pattern of the weather.


400

What are the three macronutrients?

Carbohydrates, Protein, Fat
500

If you were to place plotting compasses around a bar magnet, which directions would they point?

A - the compasses point in the direction of the field lines; away from the North pole and towards the South pole

500

Draw Earth as a giant magnet, including the arrows for your lines. Remember Earth’’s geographic north is actually a south pole for a magnet.

500

An electromagnet with 20 turns was able to lift 3 paper clips. How many paper clips do you expect it can lift if the number of turns is increased to 60?

9 paper clips

500

A 100N force is applied over an area of 5m2. Calculate the pressure.

P = F/A

P = 100N / 5m= 20 N/m2 (Pa)

500

Qingfu has a weight of 500N and sits 2 meters from the pivot on a see-saw. Calculate his moment.

M = Fd

M = 500N x 2m

M = 1000Nm