Changing thumbtack to get magnetic, and use 2 ways to destroy it.
In this demo, Professor Mason has two coils of wire that can become magnetic when it is connected to a power supply. A switch is attached to the two coils to change the direction of magnet. When the switch is on, the magnet oscillate. When the magnet is in parallel with magnetic field, the torque is zero. When the switch is on or off, it oscillates and stop. In order to keep the magnet spinning, we need to keep switching it to on and off.
2 pole vs. 3 pole
In a two pole motor, it can stop and get stuck but with a 3 pole motor, there is always some torque and that is why most motors are made with an odd number of poles.
Motor:
Next we build a motor by getting the tool from professor Mason.
After we build the motor, we start to supply power. When power supply is applied, the motor turns one way. When the power supply is reversed, the motor turns another way.
Forces on a Line of Charge :In this activities, we interpreted the magnetic field by using the right hand rule. When we are doing at the top, nothing happens to the magnetic field because the two currents are canceling out, current going up and current going down. When we go to the area on the right hand side, there are two currents going in the same direction and it gives double the magnetic field. When you go to the area in the middle, there is a magnetic field going through the center of coil.
2 pole vs. 3 pole
In a two pole motor, it can stop and get stuck but with a 3 pole motor, there is always some torque and that is why most motors are made with an odd number of poles.
Motor:
Next we build a motor by getting the tool from professor Mason.
After we build the motor, we start to supply power. When power supply is applied, the motor turns one way. When the power supply is reversed, the motor turns another way.
Forces on a Line of Charge :In this activities, we interpreted the magnetic field by using the right hand rule. When we are doing at the top, nothing happens to the magnetic field because the two currents are canceling out, current going up and current going down. When we go to the area on the right hand side, there are two currents going in the same direction and it gives double the magnetic field. When you go to the area in the middle, there is a magnetic field going through the center of coil.
Compass and Magnetic Demo:
When a current goes to top, it will make a magnetic field to around with a center. When the direction of the current is switched, the arrows change directions as well. This demo proves a rod of current has a circle of magnetic field.
.jpg)
No comments:
Post a Comment