A constant current flows in a horizontal wire in the plane of the paper from east to west as shown in Figure. The direction of magnetic field at a point will be North to South

  1. directly above the wire
  2. directly below the wire
  3. at a point located in the plane of the paper, on the north side of the wire
  4. at a point located in the plane of the paper, on the south side of the wire

Answer

If we observe the direction of magnetic field by applying right hand thumb rule then, we will find that the direction of magnetic field is from North to South below the wire.

The correct option is B.

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