A long straight wire carries an electric current of 2A. The magnetic induction at a perpendicular distance of 5 m from the wire is
(µ = 4 π x 10^-7  Hm^–1)  

1)  4 x 10^-8 T
2) 8 x 10^-8 T
3) 12 x 10^-8 T
4) 16 x 10^-8 T