A copper wire of length 10m and radius (...

A copper wire of length 10m and radius `(10^-2/sqrt(pi))`m has electrical resistance of `10 Omega`. The current density in the wire for an electric field strength of 10(V/m):

`10^4 A/m^2`

`10^6 A/m^2`

`10^-5 A/m^2`

`10^5 A/m^2`

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