A long straight wire carrying current of 30 Amp is placed in an external uniform mag. field of induction `4xx 10^(-4)` tesla. The mag. field is acting parallel to the directon of current. The magnitude of the resultant magnetic induction in tesla at a point 2 cm away from the wire is ......................... tesla.
Options:
(a) `10^(-4)`
(b) `3 xx10^(-4)`
(c) `5 xx10^(-4)`
(d) `6 xx10^(-4)`