Download GENERAL MAGNET CHARACTERISTICS (physics 2)

GENERAL MAGNET CHARACTERISTICS (physics 2)
1)
Draw the magnetic field that exists in the region around the two magnetic poles shown below.
2)
(referring to #1) If the distance between the magnet poles is tripled, what will happen to the magnetic force
which exists between the two?
Since
3)
, the magnetic force should DECREASE by a factor of 9.
(referring to #1) If the strength of the magnetic pole on the left is quadrupled, what will happen to the
magnetic force which exists between the two?
Since
, the magnetic force should INCREASE by a factor of 4.
4)
Below is a circle that represents the earth. The earth has a magnetic field even though there is not an
actual bar magnet inside the earth. However, if there were such a magnet inside the earth, draw the
orientation of this magnet as it would exist inside the earth.
5)
The phenomenon of magnetism arises from what characteristic of the electron?
Its ANGULAR MOMENTUM (spin).
6)
The name given to the characteristic mentioned in # 5 is the MAGNETIC _MOMENT_.
7)
Diamagnetic materials have no magnetic properties. Why is this?
Their particles contain no unpaired electrons
8)
What will happen to a diamagnetic object when it is placed in a strong magnetic field?
It’s electrons will orient in such a way that the object REPELS from the B-field
9)
In what way(s) does a paramagnetic object differ from a diamagnetic object? In what way are these
materials alike?
Its particles have a small # of unpaired electrons, and the material will ATTRACT to a
strong B-field.
Neither material shows any magnetic quality unless placed in a strong B-field.
10)
A steel nail is brought near a small bar magnet. Steel is a ferromagnetic material. Draw the magnetic field
that exists in the region between them.
11)
Atomically speaking, how does a ferromagnetic material differ from a paramagnetic material?
The particles of a ferromagnetic material have several unpaired electrons.
12)
What is a domain? Where are these located?
A domain is a region within the material in which all the particles have the same μ
direction.
13)
Explain why a ferromagnetic material normally shows no magnetic characteristics until placed in an external
B-field.
Each domain’s μ orientation is different from the others; they cancel each other out,
producing a material with no magnetic characteristic.
The external B-field causes the particles to rotate in alignment with the field, causing
domains to grow/shrink, producing a net μ direction throughout the entire material.
14)
You are holding a bar magnet in your hand. You drop it on to the floor, and it breaks in half (perpendicularly
to its long axis). You pick up the pieces. How many magnetic poles are you holding?
You are holding FOUR poles. Each broken end is a pole, so you are holding two bar
magnets.