When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is
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Correct Answer: Option D
Explanation:
At a point due N of the wire, the field is due east, at a point due S of the wire, the field is due west.
At a point due N of the wire, the field is due east, at a point due S of the wire, the field is due west.