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Home  >>  JEEMAIN and AIPMT  >>  Physics  >>  Class11  >>  Units and Measurement
0 votes

Dimensional formula for electrical resistivity

\[(a)\;ML^3T^{-3}I^{-2} \quad (b)\;ML^2T^{-2}I \quad (c)\;ML^3T^{-2}I^{-2} \quad (d)\;ML^3T^{-3}I^{2}\]

Can you answer this question?
 
 

1 Answer

0 votes
 
$R=\large\frac{\rho\; l}{A}$
$P=i^2R$
$R=\large\frac{P}{i^2}$
$\rho=\large\frac{RA}{l}=\frac{ML^2T^{-3}I^{-2}}{L}$
$\;=ML^{-3}T^{-3}I^{-2}$
Hence a is the correct answer.
 
answered Jun 18, 2013 by meena.p
edited May 30, 2014 by lmohan717
 
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