Electricity and Magnetism
Describe the magnetic poles: strength, type
There is a North and a South Pole on the magnet. The ends are stronger than the center.
If two objects have increased charges on them, what happens to the strength of the electrical force? What will happen to the magnitude of the force if the particles get closer together? What happens to magnetic force as magnets move apart from each other?
If the charges increase, the electrical force strength increases. If the object gets closer, the force increases. If they move apart, the force decreases.
Describe the magnetic fields formed when opposite poles are near each other. Describe them when same poles are near each other.
If there are opposite poles, they attract, but if they are alike, then they push away from each other
If you look at iron filings around two un-marked magnets, how could you tell if the magnet poles were north to north or north to south? What would you expect to see in each case with the iron filings? Draw a picture of each scenario.
If they were north to north, than the magnetss would push away from each other. If they were north to south, than the magnets would move toward each other.
What produces the magnetic field around a current-carrying wire? What is a current-carrying wire? What happens to the magnetic field as the electric current increases?
In a current-carrying wire, the magnetic fields of the flowing charges combine to produce a magnetic field around the wire. The magnetic field around a current-carrying wire forms closed circles. Because negatively charged electrons are moving in the wire, the magnet applies a force to the moving charges.
What two factors affect the strength of the electric force between objects? How does each factor affect the strength of the electric force? Does it increase it or decrease it?
The total amount of charge on both objects and the distance between the objects are the two factors that can affect the strength of an electric force between objects. It increases it if their is a charge and it deceases if there is a far distance from each other
Electric motors spin. What is making it spin? Discuss the role of the electromagnet, like and unlike poles
When the electromagnetic's poles are reversed, the electric motor spins. The poles reverse when the direction of the current changes.
List the steps on how to make an electromagnet.
A electromagnet is made by placing a ferromagnetic field, such as iron, as the core weighing the wire coil
What is a magnetic material? What is a ferromagnetic material?
A magnetic material is and material that a magnet attracts. A ferromagnetic material is a element including iron, nickel, and cobalt, that have an especially strong attraction to magnets.
What is an electric field? Describe the type of force electrical fields can apply to other objects
An electric field is a field that applies a force, called an electric force, to other charged objects, even if the objects are not touching. It can apply a negative or positive force.
What is an electromagnet? List 3 ways that an electromagnet is it different from a permanent magnet?
An electromagnet is a magnet created by wrapping a current wire around a ferromagnetic core. It's different from a permanent magnet because it is temporary, the magnetic field can be controlled, and the magnet can be turned on or off.
What is a magnetic field?
An invisible field that surrounds a magnet with iron fillings and applies a force on the other magnets
Describe the interaction between charged particles: How do oppositely charged particles interact? How do like-charged particles interact? How do charged particles interact with neutral particles
Charged particles that are oppositely charged attract each other while like-charged repel each other. Neutral charged object do neither.
Describe Earth's magnetic field: Why does Earth have a magnetic field (what is causing it?) How does it benefit life on Earth?
Earth has a magnetic field because of molten iron and nickel in its outer core. It benefits life on Earth by protecting them from the charged particles of the sun.
Contrast Earth's magnetic poles to Earth's geographic poles.
Earth's magnetic poles and geographic poles are not in the same spot. You cannot use a compass for earths geographic poles., you can only use it with the aerths magnetic poles.
Contrast Earth's magnetic poles to Earth's geographic poles
Earth's magnetic poles are around Earth while Earth's magnetic poles are above it. The Earth's magnetic poles can only be found on a compass, but the geographical poles can't.
How can a neutral atom become positively charged? How can it become negatively charged? What are charged atoms called?
In order to be charged, the atom has to be put next to an object with negative or positive electrons. Charged atoms are called protons
When does a magnetic material behave like a magnet? What has to happen to the magnetic fields of the atoms in the material for it to act as a magnet?
It behaves like a magnet when it loses its magnetic field and is still magnetic. The magnetic fields of the atoms
Why is a compass needle attracted to magnetic fields? Does it always point to the poles? Explain why or why not.
It is attracted to the arths magnetic fields because it is a tiny magnet. It always point to the poles because it is being attracted to them.
Describe how electrically charged objects interact: oppositely charged objects interact in what way? Similarly charged objects interact in what way?
It is somewhat similar to the way charged particles interact with each other. The electric force applied by an object's electric field will either attract or repel other charged objects, depending on if the charge is positive or negative.
List and describe the particles in an atom: name, location, charge
Protons, Neutrons, Electrons
Describe the forces between magnetic poles: how do similar poles interact? How do opposite poles interact?
Similar poles repel and opposite poles attract
Compare and contrast temporary and permanent magnets.
Temporary: the material is only magnetized when it is close to a magnetic filed. Once it leaves, it becomes normal again Permanent: the magnetic domains line up. If it is put in a stronger magnetic field, then the magnetic domains line up and aligned
What happens to the magnetic domains in a nail when it comes close to a magnet?
The atoms in the domain combine and cancel each other when it comes in contact with a magnet
What is the charge on an atom? Why (discuss the proton and electron count in relation to each other)
The charge on an atom is neutral, because it has equal amounts of positive and negative charges ( electrons and protons )
How do magnetic fields and electric currents affect a compass needle? Why?
The compass needle will point in the direction of the field and current because it is being attracted to it because it is a tiny magnet.
What type of particles are moving in an electric current? What determines the direction of the force on the wire?
The magnetic field is moving in a electric current. The direction depends on the direction of the current and the direction of the magnet's field.
Describe magnetic field lines: direction, where are they strongest and how can you tell, where are they weakest and how can you tell?
The magnetic filed lines always go from north to south. It is strongest right at the poles, because the magnetic field lines are closer to it. As the magnetic field lines go farther apart, the field and the force become weaker. You can tell when you put two magnets together with opposite poles, the attract each other and move toward each other. If you put two magnets toward each other from the center of it, there is nothings attracting or repelling the other
What happens to the strength of the magnetic force with distance?
The magnetic force decreases if there is a distance between the object. The force will increase if there is less distance.
What factors affect the magnetic strength of an electromagnet? How can the strength be increased - state two ways.
The size of the magnetic core and if it's wire is wound in a coil. It's strength can be increased by increasing the number of times the coil is wrapped and adding a strong core,
Where is the strongest part of an electrical field?
The strongest part is the core of the electromagnet.
Why are most objects/materials non-magnetic? Talk about the magnetic field of the atoms in most objects.
They are mostly non-magnetic because every material has a magnetic field created by the atoms constantly moving electrons
How do objects become electrically charged? What causes an object to become negatively charged? What causes an object to become positively charged?
They can be charged when rubbed against another object with a negative or positive charge. This is called static charge.
