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 wire ✓
- 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
Correct Answer: A. Clockwise in a plane perpendicular to the wire
Explanation
According to the Right-Hand Thumb Rule, if you point your thumb in the direction of current (West, moving away from you when viewed from the East), your fingers will curl in a clockwise direction in a plane perpendicular to the wire.
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