NDA 2025 Physics question

A current through a horizontal power line flows in east to west direction. What will be the direction of magnetic field at a point directly below it when viewed from east end ?

(A)Clockwise in a plane perpendicular to the wireCorrect
(B)Anti-clockwise in a plane perpendicular to the wire
(C)Clockwise in a plane of parallel to the wire
(D)Anti-clockwise in a plane of parallel to the wire

Answer: (A)

Solution

Viewed from the east end, the current flows away from the observer. By the right-hand thumb rule the magnetic field lines are then

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Question ID VK-033033