What will be the length of a nichrome wire of resistance 5.0 ohm, if the length of similar wire of 120cm has resistance of 2.5 ohm? Why? 

Asked by pdcavita | 26th Nov, 2017, 09:50: PM

Expert Answer:

straight R 1 equals fraction numerator ρxl 1 over denominator straight A end fraction
straight R 2 equals fraction numerator begin display style ρxl 2 end style over denominator begin display style straight A end style end fraction

fraction numerator straight R 1 over denominator straight R 2 end fraction equals fraction numerator straight l 1 over denominator straight l 2 end fraction
fraction numerator 5 over denominator 2.5 end fraction equals fraction numerator straight l 1 over denominator 120 end fraction

straight l 1 equals 240 space cm

resistance space is space direclty space proportional space to space length space of space wire

Answered by Gajendra | 27th Nov, 2017, 09:59: AM

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