Answer to Question #23045 in Electric Circuits for Aritra Das
of the magnetic field, which orbits the wire and is, thus, perpendicular.
Normally, under a wire carrying current South to North, the arrow would point
perpendicularly to the West. As the direction of the current changes, the arrow
would reverse to point perpendicularly to the East.
From the fact that it points in the North-West direction, we assume some
inertia of the compass arrow itself. The North component of it we preserve,
making the resulting orientation North-East.
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