Electromagnetic Induction 5/19/2014

Today we started the idea of electromagnetic induction.  Our first lab of the day was to measure the magnetic field of a solenoid.  we did this by a looping a current carrying loop over a hollow plastic tube with multiple loops.

Holding the loop in place via the hollow tubing to position the sensor of the sensor probe in line with the wire loop. 

Gradually increasing the number of loops, we discover the magnitude of the relationship of the coils as magnetic field goes up.  Each trial we logged the data using a magnetic field tube sensor via Logger Pro 

As shown 1 loop) top left 2 loops) top right 3 loops) bottom left 4 loops) bottom right.   After each collection, we eased the power off a few seconds to obtain a zero reference.

We used our logged data to calculate the magnetic fields by obtaining averages using the statistics function in LoggerPro.  We took the mean of the magnetic field of A (when the power was on going through the wire) subtracted by the mean of B (when the power turned off) to calculate the averages.   For Graph 1 above, we obtained our experimental value of 0.014 mT.  For Graph 2, 0.023 mT.  For Graph 3 0.027 mT.  For Graph 4 0.044 mT.

Our values we measured during the experiments was discarded due to the inconsistency.  We conclude that the uncertainty was due to the orientation of the sensor.  It was extremely difficult to get it perfectly aligned due to the high sensitivity.

Instead, we used nice values measured by Prof Mason because he broke(made hole) on the tube LOL.

EPIC FAIL

Next, we were given a coil of wire connected it to a galvanometer to experiment with ways that affected the needle the most by using a bar magnet in this experiment:

Factors such as the number of coils and the velocity in which we moved the magnet in and out of the coil contributed to the amount of current we measured.

Next, electromagnetic induction wirelessly just like cell phone chargers!  The BIG RED puppy was able to emit an electric magnetic so strong that it was sufficient to lit a light bulb without contact!

Prof Mason's new toy!!  tsk tsk tsk look at that beauty!!

We ended the class with a demonstration performed by Prof Mason as a current was provided to a driver coil and it was induced inside the smaller coil. The result was that the voltage induced in a smaller coil was smaller.