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OCR Physics B G495 Field and Particle Pictures June 21st 2011 Exam Thread

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Reply 560

41jms

Original post by 41jms

difference between slip ring and split commutators anyone?

anyone??

Reply 561

arianex

Original post by 41jms

difference between slip ring and split commutators anyone?

Split ring = used for DC motors, slip ring = AC motors. A split ring is, as per the name, in "two halves" so that it helps change the polarity every half turn.

Slip rings usually come in a pair for AC, with one ring attached to one end of the coil; the AC does the polarity changing itself. :smile:

If anyone wants to clear up a few more bits that I've missed out, have at it!

Reply 562

Anthz

Good luck all, lets hope for a nice paper.

Reply 563

shadow12345

Original post by Swindan

Not sure, I realised I haven't covered quarks and leptons yet, so I'm trying to give half my focus to that, and half to the pre-release. I might just go through the answers to those pre-release questions, and see what formulas and methods could come up, rather than working my way through it.

It's okay... I've completely missed out binding energy...

Reply 564

Helsy

Ahhh! The day of judgement is upon us... Good luck to everyone, lets hope it goes well.

:goodluck:

Good luck people.

good luck everyone!!

GL everyone, lets hope OCR B doesn't go wild.

Reply 568

shadow12345

Section C is gonna be crap...

i just know it

Reply 569

Obeadur

ahhh going to be lateee for this exam :eek:

Reply 570

supercal35

1st question !!
for the two capacitors , what was the voltage across the 1.5 microfarad capacitor ? was it 1.5 volts or 4.5 volts?
Physics A (sorry)

(edited 12 years ago)

Reply 571

Kooper

That paper was an absolute joke. Can you believe they made a mistake in the paper? Again, after D1?

Edit: Sorry, wrong paper. I did A...

(edited 12 years ago)

Reply 572

Kooper

Original post by supercal35

1st question !!
for the two capacitors , what was the voltage across the 1.5 microfarad capacitor ? was it 1.5 volts or 4.5 volts?

I got 4.5 volts cos charge has to be the same (I think...)

Reply 573

yutinai_ti

It was a rather nice paper, hope everyone would agree...

Reply 574

Kyleidge

Original post by yutinai_ti

It was a rather nice paper, hope everyone would agree...

Very happy with that paper! Section C wasn't even that bad... :eek:

Reply 575

arianex

Original post by supercal35

1st question !!
for the two capacitors , what was the voltage across the 1.5 microfarad capacitor ? was it 1.5 volts or 4.5 volts?

You're in the wrong thread, dude.

Original post by yutinai_ti

It was a rather nice paper, hope everyone would agree...

It was actually! :biggrin:

A few slightly "eh" moments like the 4-marker with the beta source and the plates (because I'm not that brill with that bit :tongue:

), but you gotta admit, that wasn't a ruthless paper at all. ^^

Touch wood for good grades? ^^

Reply 576

UltraMeh

Original post by arianex

You're in the wrong thread, dude.

What's the right thread?

Reply 577

Revolution is my Name

T'was alright. Though, for some of the questions in Section C, I just didn't have a clue what they wanted me to write.

Reply 578

carlcaluya

the section a and b are easy..except for the last question on section b..didnt know how to do that.. section c was hard in some 2 mark questions

Reply 579

Kyleidge

One of the first questions confused me a little
first it asked why the particles path is curved in the magnetic field, then another question asking why it was a spiral... :confused: