5/19 Electromagnetic Induction and Induction

Today we explored electromagnetic induction and induction. Using active physics we were able to get a better understanding of how they work.




We began with the study of magnetic flux and induced EMF. Using active physics, we seen the when there is a big change in magnetic flux, the induced EMF is just as big. We also concluded that negative EMF means there is a positive change in magnetic flux.

Our next assignment is a copper rod given current. We were asked to predict in which direction the copper rod would move when given current. 

What we found is that when we gave the rod a certain current, the rod would move in the direction of that current. However, when we changed the direction of the current, the rod moved in the opposite direction. This is because the current through the rod is going through a magnetic field (pictured above) which causes a force. Knowing this we can predict in which direction the rod would move.

We continued class with the study of inductors. We we found that inductance is negative EMF over the change in current with respect to time. In addition, we see that voltage is equal to inductance multiplied by the change in current with respect to time.

We continue to do some derivations and we find that current is equal to capacitance times the change in voltage over time.

Using what we found above, we are able to find the relationship between EMF and flux. Using length, number of turns, and area. 

here we have the derivation for inductance which we will use for Inductancts of solenoid. 

Given a length, area and numbers of turns, we were able to calculate inductance of solenoid.

Here we derived units of inductance, which we found to be Henry's .

For our next activity, we were asked what the current would be in a circuit after  a significant  amount of time has passed.

We found that current would plateau and goes towards infinity (pictured above).

Using ActivePhysics, we continued our study of RL circuits, which are circuits that contain inductors and resistors. We found that a change in flux would induce EMF. We also concluded that when the switch was closed the EMF would go in the opposite direction and the induced EMF opposes EMF of the battery. We also seen that when time was increased the inductiveness increased. The results of our experiment are pictured above.