Magnetic Fields
What are the two poles of a magnet?
north and south
Two objects will experience an electric force of attraction when they have ________________________
Like charges
Opposite charges
The same amount of charge
No charge
Opposite charges
Which statement best describes an electric current?
a. Energy transfers inside of an electric device
b. Charged particles (electrons) move through a conductor
c. Type of conductor or insulator
d. The measurement of the electric potential energy in a circuit
b. Charged particles (electrons) move through a conductor
A current-carrying wire produces a magnetic field
a. TRUE
b. FALSE
TRUE
What will attract to a north pole and what will repel from a north pole?
Attract: North and South
Repel: North and North
What is an electric field?
The invisible area around a charged particle where the electric force is present
What are the 3 main elements needed to build a circuit?
(1) Power Source (battery)
(2) Something to carry electricity (wire)
(3) Something to use electricity (light bulb)
The more loops in a coil wire around the core of an electromagnet, the stronger the magnetic force
a. TRUE
b. FALSE
TRUE
The __________________ is the area around a magnet where the magnetic forces act
a. Electric domain
b. Magnetic domain
c. Gravity
B. Magnetic Domain
What 2 things affect the strength of an electric field?
(1) The total amount of electric charge
(2) Distance between 2 objects
What happens to the brightness of light bulbs as more bulbs are added in a SERIES circuit?
Each bulb will be dimmer than the first bulb was
Hidden Bonus! What is the name of the new health teacher?
Mrs. Dillon
As a nail approaches the south pole of a magnet, what happens to its magnetic domain?
a. The north poles of the domains point toward the magnet
b. The south poles of the domains point toward the magnet
c. The domains spin, but end up in no particular pattern
d. The domain remains unaffected by the magnet
b. The north poles of the domains point toward the magnet
Explain why you can stick a balloon to the wall after rubbing it on your hair.
(1) Negatively charged particles (electrons) go from your hair to the balloon
(2) The balloon is now negatively charged because of the extra negative particles (electrons)
(3) This causes the balloon to be attracted to the positive particles in other objects (like the wall) causing them to stick together
What is the difference between a parallel circuit and a series circuit?
Parallel: 2 or more paths for electrons to travel along
Series: 1 path
How do you create an electromagnet?
wrapping a wire around an iron nail and running current through the wire
Explain how certain species use magnets to migrate.
The Earth is a large magnet meaning the Earth has a magnetic field that some species can sense. They use the field to navigate, and this can help certain species when they are migrating.
How are electric forces similar to magnetic forces?
Both electric and magnetic forces
(1) Follow the rules "opposites attract, same repel"
(2) Have an invisible field where their force is present
(3) Strength of the forces depend on distance and number of magnets/charged particles
Draw on the board a circuit diagram that shows a parallel circuit with 1 light on and 1 light off
See Answer Key
How can you increase the strength of an electromagnet?
1. Increase number of coil turns
2. Increase number of batteries (aka increases amount of current)
3. Increase thickness of wire (wire gauge)