Before the exam

We perform an activity that related to change of magnetic flux and the emf.

Within those activity, we observe the relationship of the rate of the change of magnetic flux and the emf produced by the magnetic field.

This is those quedtion we answered for the activity we did above.

We also performed an experiment. This time, we use a bar and let it move in the magnetic field to let the magnetic flux change.

Perform like the experiment, we practice an activity on the computer, and answer some questions like we did at the begining of the class. However, this time, we obtain the velocity of the bar.

We answer the questions from the activity. We observe that the emf if related the velocity of the bar, cause the motion of the bar change the magnetic flux, which produce emf together witht the magnetic field.

We are introduced a new concept, induction. It is similiar to capacitor we talked about before. A changing current in a coil also induces an emf in that same coil. Such a coil is called an inductor, and the relationship of current to emf is described by the inductance

we draw the graph to show the relationship between current and time, and the difference of this relationship between normal resistor and inductors.

This is the third activity we did, and this one practice to observe inductor. We answer some question to observe the relationship and components of an AC circuit that has inductor.

This is answers for question we did for the activity above

Same as capacitor, we have time constant for inductor. however, for capacitor, time constant is RC while for inductor, it is L/R, and the graph is still a function of e to some power that contains time and time constant.

Summary:

change of magnetic in magnetic field produce emf, so there will be many method to produce emf.

Inductor is different from regular resistor, but performs similar like a capacitor, and there is also a time constant for it.