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Q. Two solid conductors are made up of same material, have same length and same resistance. One of them has a circular cross section of area $A_{1}$ and the other one has a square cross section of area $A_{2}$. The ratio $A_{1}/A_{2}$ is

NEETNEET 2020Current Electricity

Solution:

$R=\rho \frac{\ell}{A}$
$R_{1}=R_{2}
\frac{1}{A_{1}}=\frac{1}{A_{2}}$
$\frac{A_{1}}{A_{2}}=1$