Day 23

Force Due to a Magnetic Field 

In this experiment, we did two experiment. First one, when two wires with same direction current, they attract each other. Second one, when two wires with different direction, they repel each other. Because two same direction current both produce field, and in the mid of two wires, their field is opposite, so they attract each other. However, in the opposite current, in the mid of the two wire, the field is same direction, so they repel each other.

In this experiment, a solenoid is used to check field. And in the experiment, we use a test tube with wire loops with current, so that the test tube produce field. Then, we move the test tube with current to close the solenoid and record the largest field value. In the same way, we increase the number of loop, and find the max field value.

 

Lenzs' Law
Changing Field produces current

In this experiment, professor mason use a magnet go though a coil. And we connect an amperemeter to the coil. During professor use the magnet go though coil, we see the amperemeter's Pointer moves. When the magnet goes though the coil, the field to the coil change, so the coil's field changed, then field produce current.

 In this experiment, professor mason, thrown two magnet into two hollow stick, aluminum stick and plastic stick. Professor mason drops then at same time, but we find the magnet in the plastic out early. In the aluminum, the magnet out later. Because when magnet fall in the aluminum stick. The aluminum stick produces a field against the magnet's field, so a force push magnet back. After the magnet leaves stick, a fore that attract the magnet is produced.