A copper wire of length 10 m and radius (10^−2/√π) m has electrical resistance of 10 Ω. The current density in the wire

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

(1) 10 - 5 A/m2

(2) 10 A/m2

(3) 10 4 A/m2

(4) 10 6 A/m2

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