magnetic poles
The _______ of a magnet are labeled north and south.
A. magnetic field
B. magnetism
C. magnetic poles
D. generator
C. magnetic poles
Because of Earth's _________, a compass needle points north-south.
A. magnetic field
B. magnetism
C. generator
D. electromagnet
A. magnetic field
When we spread iron fillings around a magnet, what is the purpose?
A. to make the magnet look hairy
B. to see the magnetic field
C. to verify the iron's magnetism
D. to test the magnet's power
B. to see the magnetic field
What is a coil of wire through which electrical current passes, creating a magnetic field?
A. a lamp
B. a rocket
C. electromagnet
D. a parallel circuit
C. electromagnet
When we made a compass in class, which object was the magnet?
A. the piece of styrofoam
B. the water
C. the plate
D. the needle
D. the needle
How many poles does a magnet have?
A. 1
B. 2
C. 4
D. 8
B. 2
Where do iron fillings near a magnet cluster most strongly?
A. around Earth's field lines
B. South pole
C. north pole
D. around the magnet's poles
D. around the magnet's poles
Where does the magnetic force operate?
A. magnetic field
B. away from the magnetic field
C. near a train station
D. in a wind tunnel
A. magnetic field
Electromagnets can ONLY produce a magnetic field when ________passes through them.
A. magnetism
B. electric current
C. lightning
D. wind power
B. electric current
Which of the following can be used to make a simple compass?
A. baking soda
B. magnet
C. penny
D. rubber
B. magnet
How do magnetic poles show magnetic force?
A. the magnets create electricity
B. the magnets are labeled north and south
C. the magnets repel and attract
D. the magnets spin
C. the magnets repel and attract
Where is the magnetic field of a magnet the strongest?
A. above the magnet
B. east of the magnet
C. far away from the poles
D. at the magnet's poles
D. at the magnetic poles
Where does the Earth's magnetic force operate?
A. on the equator
B. from the north and south poles
C. near a train station
D. in a wind tunnel
B. the north and south poles
Which of the following is an electromagnet made from?
A. a bulb
B. a compass
C. a straight wire
D. a coil of wire
D. a coil of wire
The magnet on a compass aligns with what direction?
A. northwest
B. south
C. east
D. west
B. south
It actually aligns with the north and south poles
Which pair of bar magnets will attract each other?
A. South and South next to each other
B. North and South next to each other
C. North and north next to each other
D. the poles do not matter as long as they are close
B. North and South next to each other
Which of the following forms a magnetic field?
A. motion of electric charges
B. speed of light
C. lifting of minerals
D.vibration of sound waves
A. motion of electric charges
When two of the same poles face each other, at which location do magnets repel most strongly?
A. on top of the same poles
B. in front of the same poles
C. behind the same poles
D. under the same poles
B. in front of the same poles
A permanent magnet works with an electromagnet in a motor by ______
A. The north end of the permanent magnet pushes away the north end of the electromagnet
B.The south end of the permanent magnet is attracted to the south end of the electromagnet
A. The north end of the permanent magnet pushes away the north end of the electromagnet
Which of the following can explain why Earth is like a magnet?
A. electric currents in Earth's liquid iron outer core
B. Earth's outer core is probably solid iron
C. high pressure in inner core makes Earth rotate
D. ocean currents make a flow of minerals in water
A. electric currents in Earth's liquid iron outer core
If you break a bar magnet in two pieces, will the ends formed by the break repel or attract ?
A. attract because they will have opposite poles
B. repel because they will have the same poles
C. nothing will happen because it broke
A. attract because they will have opposite poles
How can a compass be used to detect Earth's magnetic field?
A. needle moves toward the Earth's center
B. needle moves towards Earth's invisible magnetic field lines
C. needle repels Earth's invisible magnetic field lines
B. needle moves towards Earth's invisible magnetic field
Which of the following forms a magnetic field?
A. the motion of electric charges
B. the speed of light
C. the lifting of minerals
D. the vibration of sound waves
A. the motion of electric charges
What is an advantage of using an electromagnet?
A. electricity is always available
B. wires can be coiled
C. it can be turned off
D. the magnet is very powerful
C. it can be turned off
How does a compass work?
A. needle makes energy using Earth's iron
B. needle uses heat to find the sun
C. needle is attracted to Earth's magnetic field
D. needle uses satellite to find north pole
C. needle is attracted to Earth's magnetic field