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CBSE Class 10 Answered

resistance of a metal wire of length 1meter is 26ohm at 20 degree celsius Diameter is 0.3mm  What will be the resistivity .? 
Asked by sunilviswari7 | 13 Mar, 2018, 10:44: PM
answered-by-expert Expert Answer
begin mathsize 12px style R space equals space rho L over A
R space i s space r e s i s tan c e space i n space o h m comma space rho space i s space r e s i s t i v i t y space left parenthesis space capital omega m right parenthesis comma space L space i s space l e n g t h space o f space w i r e comma space A space i s space a r e a space o f space c r o s s space s e c t i o n

rho space equals space R A over L space equals space fraction numerator 26 cross times pi cross times 0.3 cross times 0.3 over denominator 1 cross times 4 end fraction cross times 10 to the power of negative 6 space end exponent equals space 1.838 cross times 10 to the power of negative 6 space end exponent space left parenthesis capital omega m right parenthesis end style
Answered by Thiyagarajan K | 14 Mar, 2018, 11:10: AM
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