The resistivity of three metals namely iron, silver and mercury are `10xx10^(-8) Omegam, 1.6xx10^(-8) Omega` and `94xx10^(-8) Omega`m respectively. Answer the following using given data (a) Which among iron, silver and mercury is the best conductor ? (b) If the length of the iron conductor is doubled, what will happen to its resistivity ? Given reason for your answers.

The resistivity of three metals namely iron, silver and mercury are `1

1.	The resistivity of three metals namely iron, silver and mercury are `10xx10^(-8) Omegam, 1.6xx10^(-8) Omega` and `94xx10^(-8) Omega`m respectively. Answer the following using given data (a) Which among iron, silver and mercury is the best conductor ? (b) If the length of the iron conductor is doubled, what will happen to its resistivity ? Given reason for your answers.
Answer» (a) Silver is the best conductor, as its resistivity is the least among these metals. (b) The resistivity of iron will remain the same, as resistivity of the material is a constant value for that material.

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