Difficult HSC questions

[sidzeman]

Hey could someone explain to me why the answer to this is B please?

[jamonwindeyer]

Hey could someone explain to me why the answer to this is B please?

It should be A - The electric field strength between two plates is uniform!

[sidzeman]

It should be A - The electric field strength between two plates is uniform!

Ahhh I see thank you! Could you also explain this question to me? To increase the deflection of the galvanometer - we need to increase the induced current in the 2ndary coil - isn't this achieved through decreasing the number of coils in the 2ndary coil? However the answer is A, which should have the opposite effect correct?

[aryak]

Could someone explain to me why the answer is C?

[RuiAce]

Ahhh I see thank you! Could you also explain this question to me? To increase the deflection of the galvanometer - we need to increase the induced current in the 2ndary coil - isn't this achieved through decreasing the number of coils in the 2ndary coil? However the answer is A, which should have the opposite effect correct?

It's B. This was my year, i.e. the year BOSTES fucked up and thought the answer was A.

Could someone explain to me why the answer is C?

(i.e. the acceleration is proportional to the acceleration)

Therefore, we are safe to literally interpret that graph as the acceleration graph as well, for the sake of a multiple choice question.

Check that you realised that you had a graph of force v.s. time, instead of something like displacement v.s. time.

[tissue]

My teacher actually did the transformer experiment in class because he thought the answer should be B but turns out experimentally it was A

[jamonwindeyer]

My teacher actually did the transformer experiment in class because he thought the answer should be B but turns out experimentally it was A

Chances are it probably would be - Essentially though, the thinking/theory required to come to that conclusion is just not quite consistent with HSC level analysis. I come back to this question a lot, I think what NESA wanted you to identify is:

- A galvanometer (ideally) has zero resistance, meaning there cannot be a voltage difference across it. This throws your usual step up/step down equations out the window, because they rely on having a load at the output.
- From here, you have to go back to first principles - Decreasing the number of loops in the primary coil reduces its resistance (and other effects like self inductance that would manifest more obviously in this scenario, I think) and is likely to have the intended effect.

Basically, this is a situation that HSC theory doesn't properly prepare you for, in my opinion. People should ignore it