Qualification > Sciences
Physics Help HERE ONLY !!
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--- 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?
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most of the latest papers were quite hard, according to me, may/june 2007..dunno about everyone else
Kim:
--- 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!
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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
12345abc:
--- 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:
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o-out of paper
x-into paper
_- cardboard
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i cant understand ur question
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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...
devileye:
hey...cn sum1 plzzzz explain eddy currents?? and hw they wrk..and the lenz law.....plz urgent!!!!asap :-\
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--- 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!
--- End quote ---
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
--- End quote ---
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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