Question

The current through horizontal straight wire flows from west to east. The direction of the magnetic field lines as viewed from the east end will be:

• A. anticlockwise in a plane perpendicular to the wire
• B. clockwise in a plane perpendicular to the wire
• C. anticlockwise in the plane of the wire
• D. clockwise in the plane of the wire

Answer 1

Answer:

A. anticlockwise in a plane perpendicular to the wire

• Anticlockwise in a plane perpendicular to the wire.

• Applying the right-hand thumb rule

• The direction of the magnetic field (at any point below or above the wire) turns clockwise in a plane perpendicular to the wire, when viewed from the east end, and anti-clockwise when viewed from the west end.