Magnets and magnet types
Magnetic fields
Coulomb's law
Electromagnets
Right-hand rule
100
What are the strongest points of a magnet?
The poles
100
Where do magnetic fields go? I.e left to right, south to north, east to west.
North to south
100
What is coulomb's law?
The farther two objects are away from each other the less they affect each other (magnetic and electric)
100
Are electromagnets permanant?
No, they will run out if the electric current within them is removed
100
What is the right-hand rule used for?
Finding the direction of a magnetic or electrical object/material
200
Do diamagnets repel or attract other magnets?
They repel magnetic fields and materials.
200
Why does the earth have a magnetic field?
Because the iron core at the center of the earth is producing it.
200
If two charged objects get close to each other what will happen?
Their effects grow with how close they are to eachother.
200
Do knots in the wire equate to electromagnetic strength?
Yes, the more knots the stronger the magnetic field will become
200
True/False you need to use 3 of your fingers for the right-hand rule to work
True
300
Can you turn a paramagnetic material magnetic?
Yes, by applying a magnetic field the electrons will line up and create a magnetic field of their own
300
How can you tell where a magnet is strongest just by looking at its field?
By looking at where the lines are most concentrated
300
If a charged object is moved farther away from another charged object what will happen?
Their forces will grow weaker
300
What are the parts of an electromagnet?
A ferromagnetic core (iron, nickel, cobolt.) A solenoid and a source of electricity.
300
If you were to find the direction of an electric current inside of a homemade electromagnet using the right-hand rule what would be most important?
A. Your thumb
B. Your index finger
C. Your middle finger
A
400
What are the main ferromagnetic materials?
Iron, Nickel, and Cobolt
400
What happens when an induced (artificial) magnet leaves the magnetic field of its creator?
It loses its magnetic properties
400
What is the formula of Coulomb's law?
400
What are some key differences between electro and normal magnets?
Electromagnets are not permanent and can be turned off, they are also created using an electric current.
400
Grip your pencil with its tip pointing to the ceiling and find the direction of its "magnetic field) using the right-hand rule, what direction is it going?
It is going rightwards.
500
Can a ferromagnetic material demagnetize?
Yes, heating, hammering, and applying alternating currents can all demagnetize an otherwise permanent magnet.
500
What type of force do magnetic fields produce?
A. Contact force.
B. Electric force
C. Non contact force
C.
500
If the distance (2mm) between two magnetic objects with a force of 100 each double what will be their new magnetic force? (round to the nearest whole tenth)
1.26
500
What would happen if you replaced the iron core of an electromagnet with brass?
The magnet would not work since brass is not ferromagnetic.
500
Grip your pencil with its tip pointing to your right and use the right-hand rule to find its direction.
The magnetic field is encircling towards the north.