Red Seal Electrician Practice
Magnetism and electromagnetismQuestion 862 of 1506

In the left-hand rule for a straight conductor, what does the thumb point along?

  1. The direction of the flux lines
  2. The direction of electron flow
  3. The north pole of the field
  4. The direction of conventional positive charge flow
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Correct answer: The direction of electron flow

The thumb gives the electron flow direction. The curled fingers show the direction of the flux lines.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 14.2: Electromagnetism

Practice magnetism and electromagnetism

Questions last reviewed: 18 October 2026