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Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 229113 times)

Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1155 on: May 25, 2010, 01:40:31 pm »
#30=C, This is because resistance in Parallel is always lower then series, this means it has to be be either C or D, however D contains a resistor so its not D and hence it has to be C.
#30=D, this is because electrons go from - to + thus if D is broken electrons will not flow to the other lamps.
#34=C, using Flemings grip rule for this one, you will find the current, and thus the direction of the Magnetic field
#37=A, Anode is always positive(this is to sharpen the image or make it more clear) remember the cathode emits NEGATIVE electrons thus the top Y plate has to be positive for it to move upwards.

Hope it helps Moonlyte :)
« Last Edit: May 25, 2010, 01:47:39 pm by Snake »
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1156 on: May 25, 2010, 01:42:14 pm »
Thanks A Lot Ari .
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1157 on: May 25, 2010, 01:43:11 pm »
Quote from: 8T on May 25, 2010, 01:42:14 pm
Thanks A Lot Ari .

Glad I could help :)
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Offline Moonlyte

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1158 on: May 25, 2010, 01:44:11 pm »
Quote from: 8T on May 25, 2010, 01:36:55 pm
For # 30 take say 5 for each resistor and remember that in C it is connected in parallel and that u use the equation R=R1*r2 over(divided by)R1+R2
I will check the rest and come back to yew dear :)

ooohhhhh now i get it! Thankss a loott!
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Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1159 on: May 25, 2010, 01:44:24 pm »
Ok I only don't understand this from the whole syllabus (excluding some atomic physics stuff)

Q33 P1 Nov/Oct 2008 http://www.freeexampapers.us/IGCSE/Physics/CIE/2008%20Nov/0625_w08_qp_1.pdf

I don't get why it is B?
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1160 on: May 25, 2010, 01:48:06 pm »
Quote from: Snake on May 25, 2010, 01:44:24 pm
Ok I only don't understand this from the whole syllabus (excluding some atomic physics stuff)

Q33 P1 Nov/Oct 2008 http://www.freeexampapers.us/IGCSE/Physics/CIE/2008%20Nov/0625_w08_qp_1.pdf

I don't get why it is B?

Ignore the values for the wire and everything else.

CONCENTRATE ON THE COMPONENT !!!!!!

Look at its max current. Got it ? Now select a fuse with a value just a little bit higher than the MAX CURRENT FOR THE COMPONENT


It should be B  ;)
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1161 on: May 25, 2010, 01:49:13 pm »
#34=C, using Flemings grip rule for this one, you will find the current, and thus the direction of the Magnetic field
Snake i do not understand this one ..care to repeat in a different way ?
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Offline Moonlyte

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1162 on: May 25, 2010, 01:51:20 pm »
Quote from: Snake on May 25, 2010, 01:40:31 pm
#30=C, This is because resistance in Parallel is always lower then series, this means it has to be be either C or D, however D contains a resistor so its not D and hence it has to be C.
#30=D, this is because electrons go from - to + thus if D is broken electrons will not flow to the other lamps.
#34=C, using Flemings grip rule for this one, you will find the current, and thus the direction of the Magnetic field
#37=A, Anode is always positive(this is to sharpen the image or make it more clear) remember the cathode emits NEGATIVE electrons thus the top Y plate has to be positive for it to move upwards.

Hope it helps Moonlyte :)

thank you very much!
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1163 on: May 25, 2010, 01:53:43 pm »
Quote from: 8T on May 25, 2010, 01:49:13 pm
#34=C, using Flemings grip rule for this one, you will find the current, and thus the direction of the Magnetic field
Snake i do not understand this one ..care to repeat in a different way ?

HERE

Click to enlarge
« Last Edit: May 25, 2010, 01:55:16 pm by Ari Ben Canaan »
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1164 on: May 25, 2010, 01:56:14 pm »
Ari you are so creative in your methods of transferring info.
Thanks Once again :]
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1165 on: May 25, 2010, 01:58:01 pm »
Quote from: 8T on May 25, 2010, 01:56:14 pm
Ari you are so creative in your methods of transferring info.
Thanks Once again :]

I've been here a loooooong time ;)
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Offline Snake

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1166 on: May 25, 2010, 01:58:27 pm »
Quote from: Ari Ben Canaan on May 25, 2010, 01:53:43 pm
HERE

Click to enlarge

Lol I was trying to explain that, guess pictures speak a thousand words :P

Oh By the way thanks for the help earlier, I finally get this nonsense lol +rep Mate :)
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Offline misterioso

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1167 on: May 25, 2010, 01:58:33 pm »
Can someone explain to me how the answer is B. I understand it has something to do with the capacitor, but why is it that voltmeter two is zero at all? Wouldnt none of them have become zero? Can anyone explain how the capaciter is working in this circuit???

I apologise for the crude picture
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Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1168 on: May 25, 2010, 02:00:39 pm »
I see..
A year and a half .. how old are you?If I may ask?
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holtadit

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1169 on: May 25, 2010, 02:03:19 pm »
Quote from: 8T on May 25, 2010, 02:00:39 pm
I see..
A year and a half .. how old are you?If I may ask?

16 in a few days time, I am doing my IGCSEs  :)
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