The resistance of a wire of iron is `10 ohm` and temperature coefficient of resistivity is `5 xx 10^-3//.^@C`, At `20^@C` it carries `30 mA` of current. Keeping constant potential difference between its ends. The temperature of the wire is raised to `120^@C`. The current in `mA` that flows in the wire now is.
A. 20
B. 15
C. 10
D. 40