Consult Figure Q24.10. A uniform magnetic field points upward, in the plane of the paper. A long wire perpendicular to the paper initially carries no current. When a current is turned on the wire in the direction shown, the magnetic field at point 1 is found to be zero. Draw the magnetic field vector at point 2 when the current is on. The image depicts Figure Q24.10, which illustrates a magnetic field and the position of two points, labeled 1 and 2. The magnetic field is represented by vertical blue arrows pointing upward, indicating the direction of the magnetic field \(\mathbf{B}\). Next to the field lines is a circular symbol with an "X" inside, representing a magnetic field pointing into the page. Points 1 and 2 are marked on opposite sides of this symbol, with point 1 to the right and point 2 to the left. This figure is often used to demonstrate concepts related to the magnetic field and the forces experienced by charged particles within the field.

Scenario - There is a uniform magnetic field at a region whose direction is pointing upwards. Long wire initially carrying no current is placed in it. Then current is applied in wire and it creates a corresponding magnetic field due to which net resultant magnetic field at point 1 is nil. Direction of magnetic field due to current carrying conductor at a point is given by Right Hand Thumb Rule. By right hand thumb rule , magnetic field at point 2 Binitial Initially applied magnetic field is upwards. BwireMagnetic field due to conductor is tangential to clockwise magnetic field produced. Hence, their net resultant Bresultant would be a combination of both of these two and lie somewhere between depending on magnitudes of magnetic fields.