Magnets
the push or pull created by magnets
Magnetic Force
a continuous flow of electric charges from one region to another
the area in which an object experiences a force that acts at a distance
A coil of wire around an iron core. The magnetic field generated by moving charges aligns the magnetic domains of the iron , making it magnetic.
Electromagnet
the force of attraction or repulsion between objects due to their charges
Electric Force
When two ends of a bar magnet repel each other, they have ____________ poles.
The same
During a lightning storm, strong negative charges at the bottom of a cloud are attracted to strong _________ charges on a tall metal pole under the cloud.
Positive
the area surrounding an object in which another object is pulled toward the object
Gravitational Field
the interaction between electricity and magnetism
Electromagnetism
North and South Poles are attracted to each other because their poles are __________.
opposite
a region where the magnetic force is detected
When a rubber rod is rubbed with fur, _______ charges move from the fur to the __________.
Negative; Rod
True or False: A student is brushing her hair. As the hair brush is brought near her head, the hair seems to reach toward the hair brush. This happens because two gravitational fields are interacting with each other.
False; Electric
___________ electric current to an electromagnet makes the magnet stronger.
Increasing
A group of atoms whose magnetic fields are lined up in the same direction
Magnetic Domain
What are the three ferromagnetic materials?
Iron, Cobalt, & Nickel
When you walk across the carpet in your socks, negative charges are picked up and then later lost because these charges are __________ to another object.
Transferred
True or False: Fields do not have mass. Scientists know that they exist because they can detect the force or energy in the field.
True
When electric charge moves through a wire, they create a(n) ____________ field.
magnetic
The closer charged objects are to each other, the ______ their electric force.
stronger
What happens when a magnet is cut in half?
The particles in the magnet realign themselves to develop a new south pole and a new north pole.
Why might a negatively charged balloon be attracted to a neutrally charged wall?
The wall has positive and negative charges in it. The positive charges realign themselves so that they can align with the negative charges in the balloon, causing the attraction.
Field lines are used to model fields. The closer the field lines are to one another, the ________ the field.
stronger
As an electromagnet's distance from paper clips ______, the magnitude of the force decreases.
Increases
If two balloons are negatively charged from a piece of wool, how will the balloons act towards each other and why?
The balloons will repel each other because they are of like charges.