Electric Charges
What charge do electrons have? What charge do protons have?
Negative, Positive
Where is the magnetic force field the strongest on the magnet?
At the poles
Why does static electricity occur?
It is the build up and transfer of charged electrons
What are the parts of an electromagnet
Ferromagnetic core (iron, nickel, cobalt, steel, etc), wire (conductor), battery (voltage source)
If an object loses electrons what is the charge?
positive
In which direction are magnetic field lines always drawn?
North to South
If you increase the current in the electromagnet what will happen?
It will have more magnetism and electricity. It will be a stronger electromagnet
If an object gains electrons what is the net charge?
Negative
Timmy broke a bar magnet in half. Explain what happens to the magnetism in the two new pieces of the magnet.
Each piece will now have a new north and South Pole. They will be two separate magnets.
Give an example of an insulator and a conductor
Answers may vary
If the current of an electromagnet stops what will happen to the magnetism?
There will be no magnetism
What occurs when a positive and negative charge are close together?
They attract
Does an object have to touch in order to feel the electric field?
No
If an atom has 7 protons, 7 neutrons, and 8 electrons. What is the charge? and why?
negative, It has more electrons than protons
What happens to the magnetic force as you move the poles together
The force gets stronger
An electric charge is negative if the field lines move towards the charge
True or False
True
Give two ways to increase the strength of the electromagnet
1. Increase the voltage, 2. increase the size of the wire to decrease resistance 3. Use more coils 4. Use a better ferromagnetic core