OCR Physics A G485 - Frontiers of Physics - 18th June 2015 Watch

Dr who11
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#1721
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#1721
please can someone link me to the unofficial mark scheme
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kieran2405
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#1722
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#1722
What did people write for the 1 marker on the overhead cables floating?


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Leechayy
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#1723
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#1723
(Original post by Alex103)
First parts of paper were harder than later parts I thought! Was really hoping for 7 mark MRI scan question but no
Hope I did enough, made some mistakes, couldn't get answer for horizontal displacement one. Oh well enjoy summer and wait for August
Yeah, the 2nd half of the paper was nice in comparison to the electricity stuff.
What do you think the boundaries will be?
I'm kind of worried now:rolleyes:

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naimmalik
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#1724
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#1724
(Original post by matthew6665)
Well I don't know which unis give such high offers.. 2 people I know are going Oxbridge and both have AAA offers :s So I guessed that ****ter unis will not have A* offers cause that's just mad.
...I have an A*AA offer to Bristol so thats clearly not the case
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Leechayy
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#1725
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#1725
(Original post by kieran2405)
What did people write for the 1 marker on the overhead cables floating?


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Magnetic field too weak to present a magnetic force to equal the weight force

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The Room Student
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#1726
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#1726
(Original post by Leechayy)
Magnetic field too weak to present a magnetic force to equal the weight force

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I went for "current is alternating so magnetic force produced would continuously fluctuate upwards and downwards".
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leroythelost
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#1727
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#1727
(Original post by kateyl)
Yeah I did all that but for some reason I got 60% i think not 64... not sure what happened in my calculation 8(
Did it ask for percentage or fraction?I wrote 0.64 as in the fraction...ffs
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Deniderveni
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#1728
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#1728
(Original post by Oraeng)
On that first question about the electron entering the magnetic field, did people put the electron decelerated to rest then accelerated in the opposite direction out of the hole????
The electric field was opposing the motion of the electron right??
I said the same thing but no, that's wrong. It does accelerate through the pd, then it accelerates towards the same direction (because it came from the positive side of the field) BUT, and I'm kicking myself for forgetting the basics of physics, LEFT. HAND. RULE! The field is exerting another perpendicular force on it, so it should be parabolic!

Although this is what my friends told me. It makes perfect sense, but I'm not sure which vertical direction it would curve in :/
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Leechayy
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(Original post by Deniderveni)
I said the same thing but no, that's wrong. It does accelerate through the pd, then it accelerates towards the same direction (because it came from the positive side of the field) BUT, and I'm kicking myself for forgetting the basics of physics, LEFT. HAND. RULE! The field is exerting another perpendicular force on it, so it should be parabolic!

Although this is what my friends told me. It makes perfect sense, but I'm not sure which vertical direction it would curve in :/
Oh thank God:p:p

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Oraeng
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#1730
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#1730
(Original post by Deniderveni)
I said the same thing but no, that's wrong. It does accelerate through the pd, then it accelerates towards the same direction (because it came from the positive side of the field) BUT, and I'm kicking myself for forgetting the basics of physics, LEFT. HAND. RULE! The field is exerting another perpendicular force on it, so it should be parabolic!

Although this is what my friends told me. It makes perfect sense, but I'm not sure which vertical direction it would curve in :/
Don't understand this at all. Doesn't the LHR only apply to magnetic fields?
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L'Evil Fish
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#1731
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#1731
I said it goes through hole
Slows down due to repulsion
Eventually attracted back to plate A

It said no weight component so no vertical displacement

And it was an electric field so no left hand rule or anything
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Elcor
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#1732
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#1732
(Original post by L'Evil Fish)
I said it goes through hole
Slows down due to repulsion
Eventually attracted back to plate A

It said no weight component so no vertical displacement

And it was an electric field so no left hand rule or anything
I said the field would take out 6eV of KE so it must reverse (since it had 4eV)
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actanide
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#1733
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#1733
(Original post by L'Evil Fish)
I said it goes through hole
Slows down due to repulsion
Eventually attracted back to plate A

It said no weight component so no vertical displacement

And it was an electric field so no left hand rule or anything

People are making me panic here haha, I am 1000000% sure there was no magnetic field involved in it!
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Raizel
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#1734
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#1734
(Original post by L'Evil Fish)
I said it goes through hole
Slows down due to repulsion
Eventually attracted back to plate A

It said no weight component so no vertical displacement

And it was an electric field so no left hand rule or anything
ohhhhhh i thought the it was negative plate at A and positive at B.
Well.. its been fun guys
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Leechayy
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#1735
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#1735
(Original post by Raizel)
ohhhhhh i thought the it was negative plate at A and positive at B.
Well.. its been fun guys
Same, rest in pieces

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Elcor
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#1736
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#1736
(Original post by kieran2405)
What did people write for the 1 marker on the overhead cables floating?


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I said the force due to the field would oscillate so the cable would oscillate :s

(Original post by Leechayy)
You do?

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No you don't, 0.01 goes into X-rays so 0.99 goes into heating the anode. For the next part you use the whole kinetic energy of 1 electron though, because that would produce the most energetic X-ray possible.
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Terry Tibbs
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#1737
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#1737
(Original post by L'Evil Fish)
Those are humanities at Oxford.

Cambridge offers are A*A*A for sciences

And somehow I don't think Cambridge is ****ter

Manchester Physics A*A*A

Cambridge, Imperial, Warwick, Manchester all give higher offers
Need the A*s for Manchester Physics, think they'll probably let me in with one A* though.
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Oraeng
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#1738
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#1738
(Original post by L'Evil Fish)
I said it goes through hole
Slows down due to repulsion
Eventually attracted back to plate A

It said no weight component so no vertical displacement

And it was an electric field so no left hand rule or anything
This is exactly what I put! Why are people confusing things
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SH0405
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#1739
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#1739
Is the unofficial mark scheme out?
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L'Evil Fish
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#1740
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#1740
(Original post by Elcor)
I said the field would take out 6eV of KE so it must reverse (since it had 4eV)
I didn't qualify my answer, probably should have
(Original post by actanide)
People are making me panic here haha, I am 1000000% sure there was no magnetic field involved in it!
Yeah there wasn't
(Original post by Raizel)
ohhhhhh i thought the it was negative plate at A and positive at B.
Well.. its been fun guys
It didn't say which was charged, it just had the field lines so you had to deduce
(Original post by Leechayy)
Same, rest in pieces

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Dw
(Original post by Elcor)
I said the force due to the field would oscillate so the cable would oscillate :s



No you don't, 0.01 goes into X-rays so 0.99 goes into heating the anode. For the next part you use the whole kinetic energy of 1 electron though, because that would produce the most energetic X-ray possible.
It would eventually fall to the ground, at first I wrote 'wobble' but then realised it would act with gravity making it fall

When it acts in opposite direction it would be in equilibrium

So eventually it'd get to surface of earth
(Original post by Terry Tibbs)
Need the A*s for Manchester Physics, think they'll probably let me in with one A* though.
Yeah, that's what Rachel needs too
(Original post by Oraeng)
This is exactly what I put! Why are people confusing things
Because they misinterpreted probably
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