June 2011 G485-Fields, Particles and Frontiers of Physics

How'd people find it??!?
I thought it went quite well, seeing as i started revising after 9 last night.
No horrible essay questions :smile:

I completely drew a blank at the point charges electric field question tho, i quickly scribbled down a field strength i reverse engineered from the force of attraction "expected answer" :colone:

Reply 861

anshul96

Original post by turboweevil

Also, I loved that mistake. Very funny OCR. Nice to see you care about this exam as much as me.

this.

Reply 862

fwed1

11

Original post by In the looney bin

Slight mistake meant i wasted 7-8 minutes on that stupid 2 mark question wondering why it wasnt working, meaning i missed a tiny bit later on.

Shouldn't be any mistakes at all :angry:

Surely your answer would have onl been off by a factor of 100?

Reply 863

Oh my Ms. Coffey

I got the force acting down - apparently this is wrong.

I think I might of accidently put the ratio as 1/3 not 3/1.

I also messed up some of the harder electricity stuff.

Electron acceleration I used EQ/M = a

Got nuclear density as something to the power ^17

Weird answers like 239.something for transformers.

Nuclear I used water as the moderator

(edited 12 years ago)

Reply 864

trapzbrah

9

fuark that paper was hard!

Reply 865

fwed1

11

Original post by Oh my Ms. Coffey

I got the force acting down - apparently this is wrong.

I think I might of accidently put the ratio as 1/3 not 3/1.

I also messed up some of the harder electricity stuff.

Got nuclear density as something to the power ^17

Weird answers like 239.something for transformers.

I think I got all the same answers as you! haha

Reply 866

anshul96

some of my answers...anyone else agree?
q1: 219 turns on coil
q2: 5.0625 seconds and lots of 10^-4 answers...
q3: 4.18 x 10^7 for something
q4: LOLOLOL reverse engineered, 32700 but i think it's supposed to be 29500...
q5: 0.016 and then 4x10^-3
q6: 10^-17 for the density
q7: H0 was 2.1 x 10^-18 and pc was 7.87 x 10^-27

Reply 867

ufochaffeuress

I swear it's downwards! The switch was off!

Reply 868

Oh my Ms. Coffey

Original post by anshul96

some of my answers...anyone else agree?
q1: 219 turns on coil
q2: 5.0625 seconds and lots of 10^-4 answers...
q3: 4.18 x 10^7 for something
q4: LOLOLOL reverse engineered, 32700 but i think it's supposed to be 29500...
q5: 0.016 and then 4x10^-3
q6: 10^-17 for the density
q7: H0 was 2.1 x 10^-18 and pc was 7.87 x 10^-27

Sounds like mine.

What was Q4?

Reply 869

In the looney bin

Answers i remember:

Time taken for electron to reach point P = 1x10^-9 seconds.
P.D Across 150 micro-farad capacitor = 1.5.
Charge across 150 micro-farad capacitor like 2.25*10^-4 or something.
Ratio of capacitors i got 1/27 = 0.037. (I believe this to be wrong)

Angle in Q4 = 18.8 degrees.

Force (upwards) caused by magnetic field = 0.016N.
New reading on the balance scales = (2.5-0.016) = 2.484 N.

Hubble constant was like 2x10^-18 seconds^-1
Critical density of universe like 2x10^-27.

Density of uranium nucleus was large, cant remember what, my assumption was no seperation distance between nucleons.

Quote/reply if you disagree/agree with any and post what you remember!

Reply 870

Oh my Ms. Coffey

Also how many of you missed the back page out :wink:

Reply 871

anshul96

Original post by Oh my Ms. Coffey

Sounds like mine.

What was Q4?

Question 4 was the electric field strength one, i worked backwards from 1.5 x 10^-4

Reply 872

Right Guard 3.D

13

I thought it was a good exam.

I didn't do well on the vector diagram question or the one with the scales.

The last half of the paper was pretty good, lots of nice explaining questions, and the first half wasnt too bad, the calculations were slightly harder than previous times.

Reply 873

Oh my Ms. Coffey

Original post by In the looney bin

Answers i remember:

Time taken for electron to reach point P = 1x10^-9 seconds.
P.D Across 150 micro-farad capacitor = 1.5.
Charge across 150 micro-farad capacitor like 2.25*10^-4 or something.
Ratio of capacitors i got 1/27 = 0.037. (I believe this to be wrong)

Angle in Q4 = 18.8 degrees.

Force (upwards) caused by magnetic field = 0.016N.
New reading on the balance scales = (2.5-0.016) = 2.484 N.

Hubble constant was like 2x10^-18 seconds^-1
Critical density of universe like 2x10^-27.

Density of uranium nucleus was large, cant remember what, my assumption was no seperation distance between nucleons.

Quote/reply if you disagree/agree with any and post what you remember!

My assumption was the nucleon was treated as a sphere for volume.

Reply 874

cleverbong

Original post by CapsLocke

you're meant to use the right hand rule, the force was upwards.

Oh yeah! You are right! Sorry about that.
This means I got it right. Cos some of the class got the force upwards.

Reply 875

XST

Overall a really good exam! Easy to pick up lots of marks in the long written questions. Now I wonder if the grade boundaries will shoot up.

Reply 876

yokabasha

Original post by CapsLocke

you're meant to use the right hand rule, the force was upwards.

Nh it's LHR, cause there's current is already there, no induction, so force is acting downwards.

Reply 877

In the looney bin

Original post by ufochaffeuress

I swear it's downwards! The switch was off!

Switch was closed yes, force depends on wether the current was going clockwise (which would make it upwards) or anti-clockwise (which would make it downwards).

Reply 878

Oh my Ms. Coffey

Original post by cleverbong

Oh yeah! You are right! Sorry about that.
This means I got it right. Cos some of the class got the force upwards.

What is it meant to act down?

Reply 879

rudebwoi93

Think I did "ok" in this paper which was all I was aiming for really... Although I too wrote downwards via flemings left hand rule, there seems to be a lot of debate on that one... Oh well ECF. The only ones I think I truly fubar'd were the electrostatic one with the angle and the force etc. Didnt get any of it correct. Other than that, account for odd mistakes here and there and we shall see on results day... Considering though being the moron I am I only started taking my notes on friday and worked flat out through the weekend trying to learn all of unit 5 by myself with only ONE resource.. Just memorised the last two topics medical and space and attempted and finished the Jan 11 paper at around 12:15am with around 74 marks.. Not too shabby. Praise theeee lowd fo' de cgp boook.

June 2011 G485-Fields, Particles and Frontiers of Physics

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