Student "edition" found at {csi dot journalspace dot com}.

Maybe I shouldn't have started this blog now, not with everything that's been going on.

In the meeting of my Introduction to Electricity and Magnetism lecture class for the fifth week of the first term, we started on the next chapter of the textbook, Electric Field.

I started that the electric field is related to the electrostatic force, except that the field exists even if there is only one charge present, and doesn't require at least two.

In fact, the formula is just the same as the force divided by the missing charge.

From here we went through all the continuous charge distributions again (rod, ring, disk, shell and sphere) and we went to the two special cases: the dipole and the infinite charged sheet.

I also asked them for the mnemonic on when to determine the direction of the field depending on if the charge is positive or negative, and when no one, even those from technical high schools, could answer, I gave it to them as an assignment.

For the examples we started with one charge in one dimension again, then two charges, then two dimensions. The exercise I gave them afterwards was with the field at a point in the middle of three charges in the shape of a triangle.

For the lab session afterwards, there were three coils submitted with fiberglass ends that were satisfactory for use in the lab.

The fourth one by the last group had plywood ends, and even painted it looked flimsy and could disintegrate any second.

As for the projects with several different turns of wire, even the best of them could only turn the compass slightly, unlike the coils.

Two of them also were not satisfactory enough for submission at that time, and had to wait until the next day.

The wires seemed loose, and looped at the bottom, they should have placed insulators like plastic or rubber there so as not to break the wires from a lot of friction with the table top.

Session 1179 could not pass on time. Class dismissed.