IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: holtadit on December 08, 2009, 02:33:28 pm
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Look at question 9 (c) of the attached paper.
How do they get I^2 R and what formula are they referring to. ?
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HELP!
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Also question 9 c ii of the attached paper .
THIS A DIFFERENT QUESTION FROM THE ONE ABOVE
How do u know in which way the flexible wire moves ? I applied flemings left hand rule but i dont know in which way the index finger points... where is the North and South poles ?
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Half am hour
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finally someone decides to help :)
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The attacjed file is corrupt. I looked up the question on my version of the paper and it doesnt look the same as yours.
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For my first question see paper 3 may june 2008
for the second question see paper 3 november 2008
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P=IV but Y=IR so P=I(IR)=I^2R
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Use the right hand grip tule on the thick wire to find the direction of the field - clockwise and left hand rule on thin wire to find direction of force - towards thick wire. Alternativley you could just use - like currents attract.
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for the left hand rule where would the index finger (magnetic field) point ? and why ?
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lemme explain it to u ..hold on
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i know the diagram sucks, but try to understand plz..
the middle finger shud point downwards, and the index finger shud point straight...hope u get it.
if not tell me..
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Wxactly right