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

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1. (Original post by Fifi93)
Here you go.
Thanks mate!! cheers Good luck everyone!
2. (Original post by Rogercbinboy)
Post 128 on page 7 of this thread.

Bricking it myself atm.
Thanks!! Better stick to them now You guys are legend!
3. anyone did the specimen paper no.11 b ii) ? I can't get the energy one at all. why it times by 3600 x 8?? per day.. isnt it 60x60x24 then?
4. (Original post by wki)
anyone did the specimen paper no.11 b ii) ? I can't get the energy one at all. why it times by 3600 x 8?? per day.. isnt it 60x60x24 then?
I got (1.8^-13)*0.8*(2*10^4)=2.88*10^-9
(2.88*10^-9)/75=(3.84*10^-11)=Absorbed dose per second
Absorbed dose*1=Effective dose per second
(3.84*10^-11)*60*60*24=3.31776*10^-6

(3.31776*10^-6)<(4*10^-6)

So it is below the safe limit. Hope that helps
5. (Original post by Jke)
I got (1.8^-13)*0.8*(2*10^4)=2.88*10^-9
(2.88*10^-9)/75=(3.84*10^-11)=Absorbed dose per second
Absorbed dose*1=Effective dose per second
(3.84*10^-11)*60*60*24=3.31776*10^-6

(3.31776*10^-6)<(4*10^-6)

So it is below the safe limit. Hope that helps
This makes much sense~ Thank you very much
6. whats the right hand rule guys?!
7. (Original post by 41jms)
whats the right hand rule guys?!
It tells you the direction of the current or the magnetic field, but it depends on what you're looking for.
8. Right hand rule is used for generators, when the motion creates a current/emf. Rather than the current causing motion.

Thumb = motion
first finger = field
second finger = current
9. (Original post by Jke)
I got (1.8^-13)*0.8*(2*10^4)=2.88*10^-9
(2.88*10^-9)/75=(3.84*10^-11)=Absorbed dose per second
Absorbed dose*1=Effective dose per second
(3.84*10^-11)*60*60*24=3.31776*10^-6

(3.31776*10^-6)<(4*10^-6)

So it is below the safe limit. Hope that helps
I did the same but apparently this answer is wrong. Apparently it's 3.84x10^-11x60x60x8
10. (Original post by Jke)
Right hand rule is used for generators, when the motion creates a current/emf. Rather than the current causing motion.

Thumb = motion
first finger = field
second finger = current
That's the left hand rule - right hand rule is your right hand doing a thumbs up and the direction of the thumb is the direction of current in a wire and the way the fingers turn around your hand (clockwise if thumb is pointing away from you, anticlockwise if pointing towards you) is the direction of the magnetic flux loops that exist around a wire carrying a current.
11. (Original post by Rogercbinboy)
That's the left hand rule - right hand rule is your right hand doing a thumbs up and the direction of the thumb is the direction of current in a wire and the way the fingers turn around your hand (clockwise if thumb is pointing away from you, anticlockwise if pointing towards you) is the direction of the magnetic flux loops that exist around a wire carrying a current.
Exactly It can also be the other way around.
12. (Original post by Summerdays)
I did the same but apparently this answer is wrong. Apparently it's 3.84x10^-11x60x60x8
Hmmm, maybe they assumed an 8 hour day at work? Thats all I can think of.
13. (Original post by Summerdays)
I did the same but apparently this answer is wrong. Apparently it's 3.84x10^-11x60x60x8
why is it 8 hours? it makes no sense
14. (Original post by wki)
why is it 8 hours? it makes no sense
Its typical ocr b to expect you to assume they'll be working "9 till 5"
15. can someone pleeease help me with 9)d)i) from last years june paper
http://www.johnbright.conwy.sch.uk/d.../G495Jun10.pdf

the answer is 4 but i really dont get how.
16. I put of physics for so long because of further maths :/ Kind of regretting it now. I need a B in this exam to get my A overall, that shouldn't be too much of an ask right? I hate this course, it sucks.
17. (Original post by wki)
why is it 8 hours? it makes no sense
(Original post by Jke)
Hmmm, maybe they assumed an 8 hour day at work? Thats all I can think of.
I know, it's really silly. There's NO WHERE in the paper where it is implied that 8 hours (instead of 24) should be used. What utter nonsense!
Its typical ocr b to expect you to assume they'll be working "9 till 5"
That's nonsense (not you, OCR B.)
19. (Original post by Jke)
Right hand rule is used for generators, when the motion creates a current/emf. Rather than the current causing motion.

Thumb = motion
first finger = field
second finger = current
Another way to remember this. If you have a set of 3-dimensional co-ordinate axes, x is current, y is field and z is force.

By the way, are you sure you don't mean left-hand rule?
EDIT: Okay, that's already been pointed out.
20. (Original post by Harry-AA)
I put of physics for so long because of further maths :/ Kind of regretting it now. I need a B in this exam to get my A overall, that shouldn't be too much of an ask right? I hate this course, it sucks.

same here, now im seriously stressing that il get an A/B !

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