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The resistivity of three metals namely i...

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.

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