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

1. A. 10 6 A/m 2
2. B. 10 -5 A/m 2
3. C. 10 5 A/m 2
4. D. 10 4 A/m 2

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