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Author Topic: igcse physics ppr 6 DOUBT  (Read 3494 times)

Offline moon

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igcse physics ppr 6 DOUBT
« on: October 31, 2009, 02:23:58 pm »
please can somebody help me Nov. 98 Q3. a
 
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nid404

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Re: igcse physics ppr 6 DOUBT
« Reply #1 on: October 31, 2009, 02:35:36 pm »
Quote from: moon on October 31, 2009, 02:23:58 pm
please can somebody help me Nov. 98 Q3. a
 

I don't hve the paper....can u upload it
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Offline moon

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Re: igcse physics ppr 6 DOUBT
« Reply #2 on: October 31, 2009, 02:45:58 pm »
here is the question.
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nid404

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Re: igcse physics ppr 6 DOUBT
« Reply #3 on: October 31, 2009, 02:54:16 pm »
R is proportional to l
if u take 5ohm/p, length will be 0.6m for 3ohms
like if u take 10ohm/m.....length for 3 ohms would be 3/10...0.3 m
and if u take 20ohm/m....length for 3ohms would be 3/20.. 0.15m....I think would be suitable.

For least resistance in the resistor in itself....a smaller length would be preferred.

If anyone has another answer and a reason to justify it....go ahead...m not a master in physics :P.....but from whatever knowledge i have...I would chose this
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Offline moon

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Re: igcse physics ppr 6 DOUBT
« Reply #4 on: October 31, 2009, 03:00:51 pm »
how did u calculated the length?
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nid404

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Re: igcse physics ppr 6 DOUBT
« Reply #5 on: October 31, 2009, 03:02:03 pm »
Quote from: moon on October 31, 2009, 03:00:51 pm
how did u calculated the length?

Just cross multiply.
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Offline moon

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Re: igcse physics ppr 6 DOUBT
« Reply #6 on: October 31, 2009, 03:07:45 pm »
thanks a lot.
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nid404

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Re: igcse physics ppr 6 DOUBT
« Reply #7 on: October 31, 2009, 03:08:16 pm »
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Offline holychalice

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Re: igcse physics ppr 6 DOUBT
« Reply #8 on: October 31, 2009, 03:11:25 pm »
but i think u shud choose a wire with more length ... cuz if u choose short length wires it cannot be accurate
as u did 0.6, 0.3 nd 0.15 ....  so d 5ohm/m shud be used ...
isnt it ?? i might be wrong ??
« Last Edit: October 31, 2009, 03:13:12 pm by M.@.N.B.i.R. »
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Offline moon

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Re: igcse physics ppr 6 DOUBT
« Reply #9 on: October 31, 2009, 03:16:17 pm »
yes, M.@.N.B.i.R. I guess u r rite!!! thanks 4 ur help.
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Offline holychalice

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Re: igcse physics ppr 6 DOUBT
« Reply #10 on: October 31, 2009, 03:16:58 pm »
do u have d mark scheme for this ppr ???
can u check .. nd lemme noe ??

« Last Edit: October 31, 2009, 03:21:58 pm by M.@.N.B.i.R. »
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Offline Ghost Of Highbury

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Re: igcse physics ppr 6 DOUBT
« Reply #11 on: October 31, 2009, 03:21:26 pm »
yes, it should be W1 as a 60cm wire can be measured more accurately.
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Offline Ghost Of Highbury

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Re: igcse physics ppr 6 DOUBT
« Reply #12 on: October 31, 2009, 03:22:30 pm »
Quote from: M.@.N.B.i.R. on October 31, 2009, 03:16:58 pm
do u have d mark scheme for this ppr ???
can u check .. nd lemme noe ??
nd can u temme hw will u identify d length of d wire to be used ?


the length can be found out be simple cross multiplication

5ohms - 1m

3ohms - 3/5m = 0.6m = 60cm
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Offline holychalice

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Re: igcse physics ppr 6 DOUBT
« Reply #13 on: October 31, 2009, 03:23:19 pm »
woooohooo .. got it rite ...
yaa ... understood dat Thanks ...
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Offline xTremep

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Re: igcse physics ppr 6 DOUBT
« Reply #14 on: November 01, 2009, 08:13:33 pm »
Quote from: A@di on October 31, 2009, 03:22:30 pm
the length can be found out be simple cross multiplication

5ohms - 1m

3ohms - 3/5m = 0.6m = 60cm

and what is the reason?
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