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Author Topic: Physics Help HERE ONLY !!  (Read 81788 times)

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Re: Physics Help HERE ONLY !!
« Reply #600 on: June 03, 2009, 06:29:18 pm »
Quote from: goin4dakill on June 03, 2009, 06:28:35 pm
Uhmmm, guyssss!
I also have to study for lit as well..as you prob all do as well.. but i was wondering.

What is the hardest past paper, in ur opinion?!?! SO i can do it?



most of the latest papers were quite hard, according to me, may/june 2007..dunno about everyone else
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Offline Kim

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Re: Physics Help HERE ONLY !!
« Reply #601 on: June 03, 2009, 06:34:47 pm »
Quote from: Aodian on June 03, 2009, 06:27:45 pm
hmm can someone tell me how to answer the whole of question nine in m/j07.. i got the mark schemes but they're vague.. to me at least.. :P thanx for the help again!
well i cant help u wid 9 a and b cause i just copied the ms ::)
c- u jus draw the dc motor
d-after each half turn the current passes from one split ring to another in the opposite direction.this ensures continuous rotating of the coil
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Offline 12345abc

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Re: Physics Help HERE ONLY !!
« Reply #602 on: June 03, 2009, 06:36:52 pm »
Quote from: kim on June 03, 2009, 06:28:24 pm
Quote from: 12345abc on June 03, 2009, 06:26:31 pm
THANX...another problem...how do we draw field lines on this:
   xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
   ___________________________________



   ___________________________________
   ooooooooooooooooooooooooooooooooooo

 o-out of paper
 x-into paper
 _- cardboard
i cant understand ur question

ok so u see,there is this cardboard and then there is this coil wound around it in the way shown...we have to draw the magnetic field pattern...i saw this in the may/june 2007 physics paper 2 for cie o'levels...
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Offline devileye

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Re: Physics Help HERE ONLY !!
« Reply #603 on: June 03, 2009, 06:37:08 pm »
hey...cn sum1 plzzzz explain eddy currents?? and hw they wrk..and the lenz law.....plz urgent!!!!asap  :-\
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Re: Physics Help HERE ONLY !!
« Reply #604 on: June 03, 2009, 06:38:31 pm »
Quote from: kim on June 03, 2009, 06:34:47 pm
Quote from: Aodian on June 03, 2009, 06:27:45 pm
hmm can someone tell me how to answer the whole of question nine in m/j07.. i got the mark schemes but they're vague.. to me at least.. :P thanx for the help again!
well i cant help u wid 9 a and b cause i just copied the ms ::)
c- u jus draw the dc motor
d-after each half turn the current passes from one split ring to another in the opposite direction.this ensures continuous rotating of the coil

for 9a..its mainly the normal explanation, that, when a current-carrying conductor, is placed in a magnetic field, it experinces a force due to the magnetic field due to the magnet and magnetic field due to current coinciding..
for b, since its the motor effect..we use flemings left hand rule...first finger, from N to S, middle finger, from + to -..and thumb gives the force, which is anticlockwise..
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Offline Kim

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Re: Physics Help HERE ONLY !!
« Reply #605 on: June 03, 2009, 06:41:33 pm »
Quote from: devileye on June 03, 2009, 06:37:08 pm
hey...cn sum1 plzzzz explain eddy currents?? and hw they wrk..and the lenz law.....plz urgent!!!!asap  :-\
eddy currents happen in a transformer
it is the leakage of current in the iron core of the transformer it happens because iron is a good conductor of electricity to reduse it the iron core is laminated into thin sheets
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After all is said and done, more is said than done.

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Offline goin4dakill

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Re: Physics Help HERE ONLY !!
« Reply #606 on: June 03, 2009, 06:42:36 pm »
Heyyy Guys!
Okay, i have some very important advice- thats a secret. So dont tell anyone!!!!!!!!!!! ha. Plus points there..hahah
DESPITE THE FACT THAT I AM NOT TELLING A STUDENT FORUM FULL OF THOUSANDS OF PEOPLE!

ANyway, So for the paper 6..the night before I did a past paper 2006 june. The first three questions in teh 2009 paper, were exactly the same. And i mean EEEZACTLY.
So, according to my calculations (inhaler, push glasses up nose, haha dork attack) umm, they might base paper 3 from June 2006 as well.

If you have an inhaler- umm I was kiddinggggg - i love people with inhalers :D <3  
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nid404

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Re: Physics Help HERE ONLY !!
« Reply #607 on: June 03, 2009, 06:43:14 pm »
check the ppt id attached for lenz's law
here https://studentforums.biz/index.php/topic,1798.315.html
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Offline devileye

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Re: Physics Help HERE ONLY !!
« Reply #608 on: June 03, 2009, 06:43:35 pm »
hmm....thx  but hw are they produced...and wat do they do..????wat's there role.. ???
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Offline Kim

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Re: Physics Help HERE ONLY !!
« Reply #609 on: June 03, 2009, 06:44:14 pm »
Quote from: goin4dakill on June 03, 2009, 06:42:36 pm
Heyyy Guys!
Okay, i have some very important advice- thats a secret. So dont tell anyone!!!!!!!!!!! ha. Plus points there..hahah
DESPITE THE FACT THAT I AM NOT TELLING A STUDENT FORUM FULL OF THOUSANDS OF PEOPLE!

ANyway, So for the paper 6..the night before I did a past paper 2006 june. The first three questions in teh 2009 paper, were exactly the same. And i mean EEEZACTLY.
So, according to my calculations (inhaler, push glasses up nose, haha dork attack) umm, they might base paper 3 from June 2006 as well.

If you have an inhaler- umm I was kiddinggggg - i love people with inhalers :D <3  

haha i guess i will do it or half way memorize dat paper then!(and dork attack?funny)
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After all is said and done, more is said than done.

By the time a man realizes that maybe his father was right, he usually has a son who thinks he’s wrong.

The early bird may get the worm, but the second mouse gets the cheese.

Offline Kim

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Re: Physics Help HERE ONLY !!
« Reply #610 on: June 03, 2009, 06:45:08 pm »
Quote from: devileye on June 03, 2009, 06:43:35 pm
hmm....thx  but hw are they produced...and wat do they do..????wat's there role.. ???
are u talkin about eddy currents?
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After all is said and done, more is said than done.

By the time a man realizes that maybe his father was right, he usually has a son who thinks he’s wrong.

The early bird may get the worm, but the second mouse gets the cheese.

Offline 12345abc

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Re: Physics Help HERE ONLY !!
« Reply #611 on: June 03, 2009, 06:46:01 pm »
 oh and can u also plz explain the purpose of split ring in dc motor and slip rings in ac generator???

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nid404

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Re: Physics Help HERE ONLY !!
« Reply #612 on: June 03, 2009, 06:46:43 pm »
Quote from: devileye on June 03, 2009, 06:43:35 pm
hmm....thx  but hw are they produced...and wat do they do..????wat's there role.. ???
the law says that the induced current is such as to oppse the change causing it(electromagnetic induction)
ppt's good ull get it
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Offline Kim

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Re: Physics Help HERE ONLY !!
« Reply #613 on: June 03, 2009, 06:48:50 pm »
Quote from: 12345abc on June 03, 2009, 06:46:01 pm
oh and can u also plz explain the purpose of split ring in dc motor and slip rings in ac generator???


they both have the same function
they connect the coil with the circuit so that currnet can flow through
or in other words after every half turn the current passes from one ring to the other  around the coil in the opposite direction.this ensures continuous rotation of the coil
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After all is said and done, more is said than done.

By the time a man realizes that maybe his father was right, he usually has a son who thinks he’s wrong.

The early bird may get the worm, but the second mouse gets the cheese.

Offline Aodian

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Re: Physics Help HERE ONLY !!
« Reply #614 on: June 03, 2009, 06:50:50 pm »
Quote from: .... on June 03, 2009, 06:38:31 pm
Quote from: kim on June 03, 2009, 06:34:47 pm
Quote from: Aodian on June 03, 2009, 06:27:45 pm
hmm can someone tell me how to answer the whole of question nine in m/j07.. i got the mark schemes but they're vague.. to me at least.. :P thanx for the help again!
well i cant help u wid 9 a and b cause i just copied the ms ::)
c- u jus draw the dc motor
d-after each half turn the current passes from one split ring to another in the opposite direction.this ensures continuous rotating of the coil

for 9a..its mainly the normal explanation, that, when a current-carrying conductor, is placed in a magnetic field, it experinces a force due to the magnetic field due to the magnet and magnetic field due to current coinciding..
for b, since its the motor effect..we use flemings left hand rule...first finger, from N to S, middle finger, from + to -..and thumb gives the force, which is anticlockwise..

ah okay.. that means the current is cutting the magnetic field and current is induced in it rite?? its got to do with induction?
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