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AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread]

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Thanks, I know your meant to spend one hour on that section. How much time do you actually end up spending on it though? Are you pushed for time? Im always pushed for time on Section As

I try and blitz MC to get it done in 35 mins then spend 70 mins on Section B so I can work on wording and redo calculations if need be :smile:

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Reply 3521

dominicwild

Original post by RemainSilent

is the answer A?

Yes

Reply 3522

Deddy

Original post by oonic0rn

thankyou so much!! any chance you could go through question 17 as well? :smile:

A positive test charge would be repelled equally by both 0.8nC charges, so the potential is twice that of one of the 0.8nC charges. V=2(0.8x10-9/4pi x 8.85x10-12 x 40x10-3).

Reply 3523

Specter

Original post by CD223

I try and blitz MC to get it done in 35 mins then spend 70 mins on Section B so I can work on wording and redo calculations if need be :smile:

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Wow. When you come across a question you dont get how long would you spend on it max before guessing an answer?

Reply 3524

a.a.k

Original post by RemainSilent

I have seen you on another thread cant remember which one :P

No idea.

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Reply 3525

IWantSomeMushu

Six marker on SHM please, AQA!

Reply 3526

you-only-live-once

any predictions? :smile:

Reply 3527

RemainSilent

I have a bad feeling for this exam

Reply 3528

fruity97

Can someone please help with question 4 c(I) http://filestore.aqa.org.uk/subjects/AQA-PHYA4-2-QP-JAN13.PDF . Why is the force on +4.0 charge going to the right and force on +6.0 charge going to the left, surely because they're alike charges they would go like this...

Reply 3529

you-only-live-once

Original post by IWantSomeMushu

Six marker on SHM please, AQA!

What would they ask about SHM and how would you answer that? :smile:

Reply 3530

Kennethm

Original post by Specter

Wow. When you come across a question you dont get how long would you spend on it max before guessing an answer?

literally 30 seconds unless you feel like you're onto something or mid-calculation.
That seems to be the most efficient.

Reply 3531

lukebiddell

Original post by RemainSilent

6 MARKER : Potato set into hard harmonic motion and describing the damping effects

Jesus christ hahaha

Reply 3532

knighty437

Original post by HyperGamma

Could someone please explain why you need AC for a cyclotron?

Thanks :biggrin:

AC accelerates the particles across the gap between the Dees. The path radius increases after each successive acceleration, so the path spirals outwards from the center of the source. The particle emerges from the cycltron when the radius of the orbit is equal to the radius of the dee. The period of the AC voltage must be equal to the time taken by a particle in one complete cycle.

Reply 3533

aprocrastinator

When do we use the RH rule?

Reply 3534

AR_95

Original post by Dante991

It's the last year of the spec, any idea of how that will reflect on the paper?

Knowing how ***** the exam boards are, they'll probably go out with a bang

Doesn't help that all the other exams people are saying have been the hardest ever. I expect them to drop the same bombshell this time

Reply 3535

fruity97

Original post by you-only-live-once

What would they ask about SHM and how would you answer that? :smile:

I'm praying they ask about a resonance one like in the specimen paper! How the phase different varies with the driving frequency!
Anyone think it could be on transformers, energy losses? That hasn't come up in a while, would be a great 6 marker!