Question

# Among iron and mercury which is a better conductor of electricity and why?

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Solution

## The conductivity of a substance depends on the resistivity of that substance, Low resistance implies high current flowResistance: The opposing tendency of a substance for the flow of current through it is known as resistance, Formula: $R=\frac{\rho l}{A}$, where $\rho$is resistivity, $l$ is the length of the substance, $A$ is the area of cross-section of the substance.The conductivity of a substance depends on $\rho$particularly as $l$ & $A$ are in our hands to adjust.low $\rho$ ⇒ low resistance ⇒ High current flow. The value of $\rho$ of Iron is $1.0×{10}^{-7}\Omega -m$ and that of mercury is $9.8×{10}^{-7}\Omega -m$. As the resistivity of iron is less than that of mercury, Iron is a better conductor of electricity.

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