Day 20 Lab 05/12/14

Magnetism Part II:

In the experiments the day before we learned how the magnetism interacts when placed around certain situations like placing in a current and using the right hand rule to find the force of magnet.

When using a coil to see the force that in which is certain aspects of the right rule causes the net force is to be zero. It is because in order to keep the coil straight, the force coming out of the sides have to be zero because in the situation the force comes out of the board and the other side of the force going into the board causing the net force to be zero.

With the known knowledge we learned about finding the force we can relate it to finding the torque of the coil when it is moving . We make the relationship using some of the variables to find the forces and make an equation tat can find the torque with the variables that are present in the system like current, length, area and the magnetic field and derive an equation that looks like T=NIABsin(phi).

This a motor that uses magnets on the side to keep the motor running when an energy supply is applied to the motor causing it to be spinning. The rotor is caused to be moved by the magnets, and applying a three voltage with slots at the top that causes a break in between slits of the silver panels shown atop of the rotor and magnets.



Using the same rotor system we were told to switch the polarity of the magnets and apply the same amount of voltage to run the rotor again. This time we gave the motor a push but it was spinning in the position after given a push goes in the opposite direction then before we switched the polarity of the magnets. Also we increased the voltage and noticed that the speed of the rotor also increased. This was to show how applying current and magnets can produce a motor that can continue to run without a push every other minute.

After seeing the motor running and how each component of the rotor affects the way it spins and how fast it spins we were given almost the same materials to make a similar motor. We were given a magnet, voltage source, paper clips and tape to make a functioning motor to keep running. We applied a certain voltage and sand the edges of the wires from the pictures shown below to reduce the friction and use the magnet to help the loops to continue to spin. At first it didn't work but some made need a push or another side of the magnet and use the interaction to keep the magnets to spin.

This is the experiment of the motor we created using the materials shown on the image because were able to apply the magnet underneath the loop make the current being passed through the wire and redirects away from the magnet causing it to spin. And also we determined that the size of the loop and shape can affect how efficient the wire spins which as a result was long and more oval shaped that made our motor run as efficient as we could. The video below this image shows the way the wire is moving around and how the current applied by the voltage causes then the right result we expected.

The video of the motor we created using a magnet and a voltage supply that creates current through the system of the object.

Our calculations showing the relationships we had from the different equations of the current, voltage and the effects supplied by the magnets. In the end of the calculations we came to the conclusion/equation which is Vab=I/rho*q*vd and be to see the way how it relates between the current and the magnet.

This is the demo set up in which we placed a circle of magnets around the pole that was being supplied with a voltage source. Using the right hand rule we can determine the current, and magnetic field causing the shoot in the upward direction and make the compass' form in a circle as well because at first the compass were point to north. We flipped the direction of the current causing the it to go in the opposite direction and the compass direction to be different as the first result we performed.   

This is a sample wire carrying current and using a compass deflection determine the magnitude of the magnetic field. At the first we found that the current in opposite direction cancels out the magnetic field and the compass received no deflection and when the current goes in the same direction the magnetic field in the second point we saw that it was double and the compass doubled the distance it deflected. And the last point it was the same result with the same distance it did in the second point.