Q2. A thin wire carrying current i is placed along positive z-axis in which current is flowing along positive z-axis. The unit vector of magnetic field at a point (a, a, 0) is
      (1)  - 2   i ^   +   2   j ^                                   (2)  - i ^   -   j ^
      (3)  - 1 2   i ^   +   1 2   j ^                               (4)  - 1 2   i ^   -   1 2   j ^

Dear student,the magnetic field must be perpendicular to the i^+j^the veactor that is perpendicular to the above veactor is - i^+j^the unit vector is - i^+j^2option 3Regards

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