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Home / Doubts and Solutions/JUNIOR/Class 6/Physics

masses of three wires are in the ratio 1:2:3 and their length are in the ratio 3:2:1 . the electrical resistence are in the ratio ?

Asked by fasalikasu 26th March 2015, 6:17 PM
Answered by Expert
Answer:

Hi,
begin mathsize 12px style Resistance comma space straight R space equals space ρL over straight A But comma space straight V equals straight m over straight d space and space straight V space equals space AL rightwards arrow space straight A space equals space straight V over straight L space equals space fraction numerator straight m over denominator space dL end fraction So comma space straight R space equals space fraction numerator ρL squared straight d over denominator straight m end fraction straight R subscript 1 space colon space straight R subscript 2 space colon space straight R subscript 3 space equals space straight L subscript 1 squared over straight m subscript 1 space equals space straight L subscript 2 squared over straight m subscript 2 equals straight L subscript 3 squared over straight m subscript 3 end style 
                 = 27 : 6 : 1

Answered by Expert 26th March 2015, 6:44 PM
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