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In Hall effect measurements ina sodium...

In Hall effect measurements ina sodium conductor the strength of a transervse field was found to be equla to `E = 5.0 mu V//cm` with a current density `j = 200 A//cm^(2)` and magentic induction `B = 1.00 T`. Find the conentrations of the condiction electrons and its ratio to the total number of atoms in the given conductor.

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