Electric Energy
As charge increases, electrical force decreases.
True/False
When charge increases, electrical force INCREASES
What do you call the area around an object where the magnetic force acts?
Magnetic field
A wire that is carrying a current also produces a magnetic field.
True/False
True
What material should be used for the core of an electromagnet?
What particles move to create charge?
Electrons
Objects with _____ charges are attracted to each other.
Opposite
What happens when you bring the north ends of two magnets together?
They repel
If electricity moves through coils around an iron core, what will be created?
A magnetic field
An electric generator always needs a battery.
True/False
False
It only needs two magnets and wire
The south pole of a magnet ____ the north pole.
Attracts
As distance increases, the electrical energy between two charged objects will do what?
Decrease
What do all magnets have?
A north pole and a south pole
If a magnet is placed near coils of wire and spun with mechanical energy, what will be created?
An electric field
What are the three things you can do to increase the strength of an electromagnet?
1. Add coils
2. Increase voltage
3. Decrease distance
What are the two things that can be done to increase electrical energy?
1. Decrease distance
2. Increase charge
What do you call an item that does not allow electricity to flow through it?
Insulator
What do you call an object that has the same amount of positive and negative charge?
Electrically neutral
An electric generator is turned using what kind of energy?
Mechanical energy
Ms. Dow builds an electromagnet with a battery, wires, and a nail. It doesn't work. What can she do to make it better?
Add more coils, increase the voltage, etc.
What two colleges did Ms. Dow go to? (hint: they are both in Boston)
Northeastern and BC
What can you do to increase the electrical potential energy? (two things)
Increase the charge, increase the distance
What do you call the area in an object where the magnetic fields all point in the same direction?
Magnetic domain
Why are electromagnets useful?
They can be turned on/off, their strength can be changed
An electric motor spins because the permanent magnet and temporary magnet attract each other only.
True/False
False
They attract AND repel each other
As a metal piece comes near the north end of a magnet, what happens to its magnetic domains?
The south poles of the domain point towards the north pole of the magnet