Day 19 Lab 05/07/14

Magnetism:

In this experiment we learned how the interactions of magnets happen between themselves, an applied current, and voltage being applied. The result of trying to see how they interact is using lines like the one used in electric fields because it shows the magnetic field, B, and how they can effect the different variables like the force of the field. The use of compass, which points North, revealed that the magnets will always have the a north and south when broken in half over and over. And to see why that happened, aluminum particulates where place on top of a magnet to see the interactions and revealed that the magnetic fields are circles going from south to north. We had to comprehend these simple material of magnetism in order to actually understand in harder situations why the result is what it is when done. And finally the experiment that uses the right hand rule to help a student picture the field, the force and current to make the problem understandable.

The field produced by a magnet when using a compass because the compass point north which as a result the field points to the north part of the agent. And when it came to the south part of the magnet the compass arrow flips around and the results are shown in the image above. Also the field shows that the lines form in a circle when moved around and we'll see the actual lines of the magnet.  

The aluminum particulates reveal that the line are circular in the shape and they get bigger as they are placed closer to the top of the magnet. The particulates are more bunched up at the top of the magnets and the lines can travel from the south part of the pole to the north or can be vice versa.



This is the group's drawing regarding to the image prior seeing the field lines moving in a circular shape with direction off the lines. As explained in the image before reveals that the interactions move from the south part to the north part of the magnet and back. 

Using Gauss' Law we can draw a surface to determine the total value of the lines in the system in which in this experiment turned out that the net flux was zero. Just like the law used in electric surfaces, we can use Gauss' Law to see the total results and get values to the unknowns in the system. The equation of Gauss' Law when applied to magnetism is the integral of B*dA in respects to x. 

A practice problem using the right hand rule to determine the direction of the force when the other known variables are given to make the rule more easier to see in which the direction was going into the board. And we  know that the F=|q0|v x B and the rest of the problem was easier to solve using the new set of tools we were given.

 In the next part of the experiment we introduced electricity into the system of magnets and see how they will interact when current runs through. The experiment was having a magnet on the edge with two plates running with current and a copper pipe is placed to see what would happen when the current is turned on and why the pipe rolls in the direction it does whether it goes up, down, into the magnet or outwards from it. The image that will be shown reveals a better picture of the set up and the results were using the right hand rule made the situations easier to understand because your thumb is the force while the fingers are the current of the system and when curving the fingers you can see the magnetic field being applied. And given some known values from the experiment we were asked to find the actual value of the magnetic B that was shown and being applied to the system using all the prior knowledge that we learned which also concerned momentum regarding the copper pipe.

This is the lab setup explained above and saw how the application of current into the system causes the magnet to do on the copper pipe. Through out the experiment the current flows from positive to negative but to make interesting the flow was switched but using the right hand rule the group was able to correctly predict the way the pipe was going to roll.

We were given values to the experiment shown in the image prior to this one to find the value of B in the system to prove and apply certain equations to find the value. For example since the copper pipe was rolling when moved away from the magnet it applied movement of inertia and it takes into account when find the value as well as the angular velocity of the pipe and etc.

As shown the image we were given a square and we had to find the torque using only half the box and find the equation of the torque when using it. F=ILB and replaces it in the equation of LxF which as a result we came to the equation of IABsin(phi) because L^2 I the same as area in the system.

In the situation of the force going one way from the board and as shown the picture it was changing because it is a current and we had to use integrals to define to the force when it came to that certain place when it was rotation and the situation on the sides can out to be the same thing in order to keep it from rotating.

The set up of making the copper wire rotate by applying current into the experiment but it stopped when it reached to its side and later we will learn how to keep it rotating making it an engine or a motor that doesn't stop when using the magnet to power the system.