Day 25

  By Faraday's law, change in current through the inductor will change the magnetic field, it produces an induced EMF.

  This is a current vs. time graph. As time goes long, inductor voltage will decrease and current will increase.

  Then professor gave us a problem to solve. We known resistor is 100 o, we know the area of the inductor and it is 110 turn. So we could found L.

  Then we calculate the resistant of the wire and found the time constant by using the equation L/R.

  Then we found period is 2.55*10^-5.

  We started doing an oscilloscope experiment.

  These two pictures show our set up. We connect the function generate, oscilloscope, resistor and inductor as a circuit.

  First, we found out the time constant is 4.9*10^-6 by using the equation t_1/2 divide ln2. Then we used equation L/R to found L. Last, we found N is 108 which is very close to 110.

  Then we started to do a question that professor gave us.

  There are the answer we found out.

Conclusion:
  Everything we did today is about inductor. First, we learned Faraday's law. Then used the information that professor gave us to calculate L and time constant. After, we did an experiment to prove our calculation is very close to experimental answers. Last, we did a long problem that professor gave us.