Basic Magnetic Force
Magnetic materials often contain _______________ elements.
ferromagnetic
Earth's magnetic field is due to spinning molten iron and nickel in which layer?
outer core
The electric charge of an object is determined by the number of ____________ present in its atoms.
electrons
Rubbing a pencil or a balloon to give it an electric charge is an example of which charging method?
charging by friction
All metals in which electrons can easily move freely are ________________.
conductors
The magnetic force is a ________________ force that acts without touching other objects.
noncontact
In an unmagnetized material, all of the magnetic domains are ____________.
random
The electric force is a ________________ force that can act without touching other objects.
noncontact
Rubbing your shoes on a carpet and then touching a metal door handle can shock you. Touching this door handle is an example of charging by which method?
charging by conduction
Give three examples of electrical insulators.
Glass, rubber, plastic, wood, fabric, and air
What three elements have an especially strong attraction to magnets?
iron, nickel, and cobalt
How are Earth's magnetic poles different than Earth's geographic poles?
Earth’s south magnetic pole is at its geographic north pole, and Earth’s north magnetic pole is at its geographic south pole.
What two things determine the strength of the electric force between two charged objects?
the total amount of charge on both objects and the distance between the objects
In the video where the charged PVC pipe was brought near the aluminum can it caused it to roll around on the table without touching it. Which method of charging is this an example of?
Charging by induction
The needle on a compass aligns with and points in the directions of Earth's magnetic ________ ________.
field lines
Where on a magnet is the magnetic force the strongest?
At the magnet's poles where the field lines are the closest.
Explain two different ways magnetic potential energy could be introduced into a system of magnets.
pushing two like poles together, separating two opposite poles
Explain the difference between an electrically charged object and an electrically neutral object.
An electrically charged object has an unbalanced amount of positive charge or negative charge. An object with equal amounts of positive charge and negative charge is electrically neutral.
Explain two different ways electric potential energy could be introduced into a system of electrically charged particles.
pushing two like charges together, separating two opposite charges
Why did the paperclips stay attached to each other even after the magnet was removed from them?
Their magnetic domains were still aligned as the magnetic field had turned them into temporary magnets.
Explain how the poles of magnets act when they come near the poles of other magnets.
If similar or like poles of two magnets, such as north and north or south and south, are brought near each other, the magnets repel or push away from each other. If the north pole of one magnet is brought near the south pole of another magnet, the two magnets attract. This means the magnets will pull together.
Like poles repel and opposite poles attract.
Explain why you should never put a magnet near any electronic devices.
The magnet will cause all of the magnetic domains in the device to line up and it will no longer function in the intended way.
Explain how electrically charged particles will act when they come near other electrically charges particles.
Similarly charged particles repel each other and oppositely charged particles attract each other.
Why are your Chromebooks and Chromebook chargers covered in plastic?
The plastic acts as an insulator to prevent you from getting shocked by the electrons flowing through the metal conductive parts.
What is the difference between the magnetic force and the electric force relating to metals?
Only certain metals are strongly affected by the magnetic force, but all metals are strongly affected by the electric force