Two conductors of same length and area, made of two materials of resistivity \( \rho_{1} \) and ...

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Two conductors of same length and area, made of two materials of resistivity \( \rho_{1} \) and \( \rho_{2} \) are connected in parallel to a source of potential \( \mathrm{V} \). The equivalent resistivity for the same length and area is
a. \( \rho_{1}+\rho_{2} \)
b. \( \frac{\rho_{1} \rho_{2}}{2\left(\rho_{1}+\rho_{2}\right)} \)
c. \( \frac{\left(\rho_{1}+\rho_{2}\right)}{\rho_{1} \rho_{2}} \)
d. \( \left|\rho_{1}-\rho_{2}\right| \)
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