A long straight wire carrying a current of 30 A is placed in an external uniform magnetic field of induction 4×10⁻⁴T. The magnetic field is acting parallel to the direction of current. The magnitude of the resultant magnetic induction in tesla at a point 2.0 cm away from the wire is (μ0=4π×10⁻⁷H/m)
O 10⁻⁴
O 3×10⁻⁴
O 5×10⁻⁴
O 6×10⁻⁴
