Lab 11: Electromagnetic Induction

 For lab 11 we experimented with electromagnetic induction using a Magnet, coils with varying number of windings, a galvanometer, a power supply, and connecting wires. We were tasked with influencing the magnitude of the inducting current, shown on the galvanometer. To do this we first experimented by hooking a magnetic coil to a galvanometer and ran a magnet through the coil, alternating its sides and monitoring the galvanometer. We found that running the magnets through the coil would cause the galvanometer to register an increase when the north side was run through the coil and a decrease when it left, while the opposite was true when the south side went through it. This was due to the magnetic field that the magnet possessed, which changed to the coils electric current causing the changes.

Next we experimented with the voltage of the coil. We hooked a power supply to the coil and experimented with changing the voltage run through the coil. We found that increase the voltage decreased the current, and again the inverse caused it to increase. This was caused due to the coils current working to compensate and equalize for the voltage to equalize its magnetic field.

Next we experimented with a second coil, we added a second coil to the first and linked the two but did not link the second to the power supply. This caused the reverse effect of the previous experiment, with the second coil equalizing the first and thus causing it to increase its magnetic field to compensate.

Finally we repeated the previous experiment but with a magnet, in this occasion we found that the second coil had the reverse reaction to the first, noting that it’s current would increase with the south side of the magnet and decrease with the north.

from these experiments we were able to note that many things increase the coils magnetic field, the facing of a magnet that is brought into it, reducing the voltage introduced to the coil, and the introduction of a second coil that will experience a reverse version of all of the different ways that we attempt to influence the magnetic field with. Thus there are a large amount of things that can influence a coils magnetic field, and in many ways.