🔵 ELECTROMAGNETS
What changes will make an electromagnet stronger?
Increasing coils
Decreasing distance
Increasing the battery size or voltage
Increasing the core size
Do like poles attract or repel?
(Repel)
What materials allows electricity to flow?
Conductors
What 2 things affect gravity?
Mass and distance
Can magnetic force act without touching?
Yes)
Which materials combination make the strongest electromagnet?
Iron + wire + high voltage
What happens when magnets get closer?
(Force increases)
What particles move in electricity?
Electrons
What happens to gravity when distance increases?
(It decreases)
What happens when two negative charges meet?
(Repel)
What happens when you increase the number of wire turns?
(Magnetic force increases)
What happens if you cut a magnet into pieces?
(Each piece has N and S poles)
What is charging by induction?
Charging without touching
Who feels the least gravity on a mountain?
Person at the top
What happens when charged balloons get closer?
(Repel more strongly)
A student builds two electromagnets. One uses tightly wrapped coils, and the other uses loosely wrapped coils.
The tightly wrapped coils will be stronger because the magnetic field is more concentrated.
Which object feels the least magnetic force?
(Farthest away object)
Why do hair and a comb attract after rubbing?
Friction → opposite charges
Two objects have the same mass. In one situation they are far apart, and in another they are much closer together.
How does the gravitational force change between these two situations, and why?
The gravitational force is stronger when the objects are closer because gravity increases as distance decreases
What makes an electric motor stronger?
(More coils + bigger magnets)
A student places the north pole of one magnet near the south pole of another magnet.
What will happen to the magnets, and how will their motion change as they get closer?
The magnets will attract, and the force between them will increase as they get closer.
What happens when opposite poles face each other?
They attract
What causes charge movement in materials?
Electron movement
If Earth got bigger, what happens to gravity?
(It increases)
What happens when magnets are closer together?
(Stronger force)