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The motor effect: Fleming's left-hand rule and F = BIl

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The key ideas and the summary sheet for this lesson are ready now.

Key ideas

  1. A current-carrying wire in a magnetic field feels a force; this is the motor effect.

  2. Fleming's left-hand rule: first finger = field, second finger = current, thumb = motion.

  3. Reversing the current or the field reverses the force.

  4. F = B I l: force (N) = magnetic flux density (T) × current (A) × length (m), for a wire at right angles to the field.