A wire 50 cm long and 1 mm^(2) in cross-...

A wire 50 cm long and 1 `mm^(2)` in cross-section carries a current of 4 A when connected to a 2 V battery. The resistivity of the wire is

`1 xx 10^(-6) `

`4 xx 10^(-7)`

`3 xx 10^(-7)`

`2 xx 10^(-7)`

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