Exam 2 - good or bad?

[fisa2001]

 Electric power and Synchrotron were alright, few complicated questions in Electric power but that was about it. But when I looked at Light and matter.....



Not enough time to finish it . Probably only got like 6/20 from it.... Hopefully I get a C+...

[Charlatan]

Just to clarify:

Magnetic north does not refer to the "north pole" if you were to imagine earth as a bar magnet.

Magnetic north is the direction in which a compass needle says north is. This is different to "true north" which is towards the North pole (The geographical one in the Arctic). Going with the earth-is-a-bar-magnet idea, magnetic north can be equated to that magnet's south pole.

Looking that up, holy crap, you're right. While I'm happy that I got that mark, this is some of the least intuitive crap I've ever seen...

Unfortunately the definition doesn't have origins in Physics, where, given the prevalence of the bar magnet analogy, it is unintuitive. "Magnetic North" is primarily a navigational term and it is one of three North points you might find on any topographical map. It refers to north as given by a compass, as opposed to north given by the direction to the north pole or north given by the direction of Eastings (the vertical lines on a map).

[WhoTookMyUsername]

Thought was standard VCAA physics in every way.

[FlorianK]

Wasn't too bad of an exam imo.
For the magnetic flux MC question. The second one asking for the EMF, all answers were wrong. I said D because it was not too bad of an answer, but it was essentially not correct.

[jamesp658]

In the same way we define up as positive and down as negative when dealing with forces etc, voltage can be defined as positive or negative depending on the point of reference. So although yes the directions on the emf-t graph multiple choice question are upside down, we have been trained to only deal with conventional current, if we simply switch polarity, what we take reference from has changed, and the result would be D.

Another point there is, no value are on the y-axis. It's not absurd to have negative values above the x-axis and positive values below.
Just some things to consider. Answer's D nonetheless.

[Nick Nack 94]

Wasn't too bad of an exam imo.
For the magnetic flux MC question. The second one asking for the EMF, all answers were wrong. I said D because it was not too bad of an answer, but it was essentially not correct.

Yeah, that question was fucked haha. D was the least incorrect so I went with that.

[FlorianK]

in the exam I wrote down that all answers are incorrect and draw the correct one.
Still wrote down D of course

[Fearsword]

Wow, most of answers to my exam matched itute . Surely i'll get a better grade for this exam than the C i got for unit 3

[dangm12]

Only 2 MC questions wrong, is that A+ territory? Predicted study score for a middle B+ exam 1 and only 2 MCQs wrong in exam 2?

[WhoTookMyUsername]

Wasn't too bad of an exam imo.
For the magnetic flux MC question. The second one asking for the EMF, all answers were wrong. I said D because it was not too bad of an answer, but it was essentially not correct.

Can't remember this one, don't htink i put D, was this the one where he moves that coil out of the field?
(what were the 4 options?)

[FlorianK]

Wasn't too bad of an exam imo.
For the magnetic flux MC question. The second one asking for the EMF, all answers were wrong. I said D because it was not too bad of an answer, but it was essentially not correct.

Can't remember this one, don't htink i put D, was this the one where he moves that coil out of the field?
(what were the 4 options?)

The question for the EMF not the flux.
A was a trapezium (correct for flux)
B was a triangle
C was a different triangle
D were 2 boxes one positive and one negative (correct one for the aforementioned emf question)

[eddynewcs]

Wasn't too bad of an exam imo.
For the magnetic flux MC question. The second one asking for the EMF, all answers were wrong. I said D because it was not too bad of an answer, but it was essentially not correct.

It had no scale on the EMF axis, so there was no way of knowing which was positive and which was negative. So D was the correct answer, not just the least incorrect

[bobbyz0r]

Usually those EMF graph questions are worded "best describe". That doesn't mean the answer has to be correct, but just needs to be the best out of the four to represent the EMF graph.

[vcestudent94]

Just checking, which was 'D' for the emf question. Was it the graph that had a negative value followed by 0 then a positive value?

[daniel034]

Just checking, which was 'D' for the emf question. Was it the graph that had a negative value followed by 0 then a positive value?

`twas indeed