Physics Exam 2 (End of Year) thoughts

[Greggler]

I did positive voltage at the start, then into a negative voltage? would i get a single mark for this atleast?

[physics]

QUESTION! WAS THERE ANY FLUX IN QUESTION 2... MY HAND TOLD ME THERE WAS SO I ASSUME MY HAND WASNT LYING BUT ITUTE SAYS THAT IT WAS :"(

[garliczombie]

for the very very first question is it n on the left and s on the right ..thats what i got

yea im 95% sure you are correct. itute may have made a mistake

[Blakhitman]

It's faraday's for sure.

[m@tty]

for the very very first question is it n on the left and s on the right ..thats what i got

yea im 95% sure you are correct. itute may have made a mistake

Yep, you're right physics. The field lines go from the left around to the right, I'm certain.

[Blakhitman]

for the very very first question is it n on the left and s on the right ..thats what i got

yea im 95% sure you are correct. itute may have made a mistake

So the arrows go through the solenoid from right to left, don't see how itute is wrong.

[SixWinged]

I did positive voltage at the start, then into a negative voltage? would i get a single mark for this atleast?

Personally I believe you're OK since no indication is given of which terminal of the voltage meter is hooked up to which wire, but don't be surprised if you lost 1 mark by VCAA marking standards.

[Xavier1234]

QUESTION! WAS THERE ANY FLUX IN QUESTION 2... MY HAND TOLD ME THERE WAS SO I ASSUME MY HAND WASNT LYING BUT ITUTE SAYS THAT IT WAS :"(

the effective area of the plane was parallel to the mag.field. flux=field(area sintheta) = BAsin0 = OWb

[m@tty]

It's faraday's for sure.

Yeah it was Faraday's mostly. BUT you also had to use Lenz's law to get an emf opposite in direction for the second part. SO I wrote "Faraday's law (and Lenz's)"..

[Xavier1234]

the first first question : the one about drawing the lines.

oh yeah it was Left-North

[physics]

QUESTION! WAS THERE ANY FLUX IN QUESTION 2... MY HAND TOLD ME THERE WAS SO I ASSUME MY HAND WASNT LYING BUT ITUTE SAYS THAT IT WAS :"(

the effective area of the plane was parallel to the mag.field. flux=field(area sintheta) = BAsin0 = OWb

NOOOOOOOOOOOOOO! (as in agreeing with you sorta no) damnnnnnnnndmamandndndndnd

[nehcrow]

Um, how many marks would I lose from the graph question if i confused the positive and negative parts around?

[Blakhitman]

It's faraday's for sure.

Yeah it was Faraday's mostly. BUT you also had to use Lenz's law to get an emf opposite in direction for the second part. SO I wrote "Faraday's law (and Lenz's)"..

The negative part was from the negative in the formula, basically emf=negative gradient of flux(field) Vs time graph.

Gradient was positive for the first part and negative for the second, so the emf was negative, then positive...

[m@tty]

Faraday's law has no negative in it..

And I don't think it necessarily had to be negative then positive.. You don't know which way the voltmeter was connected.. So it could read positive then negative.

[Blakhitman]

Faraday's law has no negative in it..

And I don't think it necessarily had to be negative then positive.. You don't know which way the voltmeter was connected.. So it could read positive then negative.

Yea the order didn't necessarily matter...

I guess you could be right...