Day 24

  At beginning of the class, we did a online exercise about magnetic flux and EMF.

  These are the answer for the online exercise.

  These pictures show the experiment we did in class. When professor gave current to the stick, the stick will move. Then, professor gave opposite direction of current, the stick will move opposite way.

  This is the diagram we draw to explain the experiment.

  This is another online exercise we did in class, it is about motional EMF.

  There are the answers for the exercise.

  We use the equation V=L*dI/dt, V=RI and C=Q/V to find that V=1/C integral I dt.

  Then we found out L= u*N^2*A/L.

  We used the equation we found above to calculate a problem and the answer we got is 9.87*10^-7 H.

  This picture shows the unit we found for L and J.

  There is the diagram we draw for a RC circuit. And a I vs. t graph.

  In this picture, professor showed us the relationship of T, L and R.

  This is the last online exercise we did in class, it is about RC circuit.

Conclusion:
  Today, we did lots of online exercise and an interesting experiment. First, we did a online exercise about magnetic flux and EMF. Then professor showed us a experiment, when gave current to a copper stick, the stick will move; if give opposite direction of current, the stick will also move opposite direction. After, we found out a new equation L= u*N^2*A/L. Last, we did another online exercise about RC circuit.