Magnets

Shane Simpson

magnetism

1)What is magnetism?


A physical phenomenon produced by the motion of electric charge, resulting in attractive and repulsive forces between objects.


2)What are magnets?


A piece of iron (or an ore, alloy, or other material) that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other iron-containing objects or aligning itself in an external magnetic field.


3)What There are temporary and permanent magnets?


Are those which act like a permanent magnet when they are within a strong magnetic field, but lose their magnetism when the magnetic field disappears. Examples would be paperclips and nails and other soft iron items.


4)What are permanent magnets?


A magnet that retains its magnetic properties in the absence of an inducing field or current.


5)what are electromagnets?


A soft metal core made into a magnet by the passage of electric current through a coil surrounding it.

magnetism

6)What are superconductors?


A substance capable of becoming superconducting at sufficiently low temperatures.


7)Who discovered magnets?


Joseph Black


8)Name four facts about magnets.


North poles point north, south poles point south.

Like poles repel, unlike poles attract.

Magnetic forces attract only magnetic materials.

Magnetic forces act at a distance.


9)Name five other planets that have magnetic fields.


Mercury,Earth,Jupiter,Saturn,and Uranus

Answers to questions to 10-12

questions 13-14

13) List 10 uses of magnets

1. Locate metal studs in a wall.

2. Seal off air-conditioning vents to improve home heating by placing vinyl-coated sheets over the steel register faces.

3. Hang Polaroids of projects-in-process on the lip of a metal shelf above the workbench.

4. Collect nails from a porch repair job that have fallen in the grass.

5. Prevent corrosion inside your water heater; a magnet placed on the freshwater intake pipe catches damaging metallic calcium particles before they can get inside.

6. Pin blueprints onto the side or hood of the truck.

7. Create a bulletin board without the use of tacks, tape, or hooks on walls coated with "magnetized" paint containing metals.

8. Protect a tractor's engine: Ceramic magnets placed in the oil pan will attract steel bits that get into the oil from grinding pistons.

9. Fasten steel framing squares to the outside of toolboxes for quick access by gluing magnets to the box sides.

10. Clean up metal shavings that have fallen from the bench grinder onto the workshop floor.


14) How do magnets make life easier or better?

Magnets (both permanent and electrical) are used in speakers to reproduce sound so you can hear what it sounds like when doves cry. Magnets are pretty handy in magnetic resonance imaging (MRI) that show where your brain tumor is. Magnets are used in most electrical motors so your little beanie propeller can spin around. Billions of magnets make a hard drive. You can swipe a magnet across a fluorescent lamp to relight it. Some magnets help you bring back lost family members. Electromagnets cause embedded structures in liquid crystal displays to rotate leading to a dark area that we call a pixel. You may or may not be a magnet. This may or may not make your life easier.