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igcse physics ppr 6 DOUBT

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moon:
please can somebody help me Nov. 98 Q3. a
 

nid404:

--- Quote from: moon on October 31, 2009, 02:23:58 pm ---please can somebody help me Nov. 98 Q3. a
 

--- End quote ---

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

moon:
here is the question.

nid404:
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

moon:
how did u calculated the length?

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