The current density (number of free electrons per ${{\rm{m}}^3}$) in metallic conductor is of the order of

JEE PHYSICS MCQ: CURRENT ELECTRICITY

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The current density (number of free electrons per

{\mathrm{m}^3}

) in metallic conductor is of the order of

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Correct option: D

{10^{28}}

Option D (

{10^{28}}

) is correct because the number density of free electrons in a typical metallic conductor is on the order of

10^{28}

per cubic meter.

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\mathrm{\rho }

3\,\,{\mathrm{m}^3}

3\,\,\mathrm{\Omega }

4.7\,\, \times \,\,{10^6}\,\,\mathrm{\Omega }\,\, \pm \,\,5\,\,\%

22.5\,cm