The invisible physics of how electricity creates physical motion
In short: When an electric current meets a magnetic field, it doesn't just sit there—it moves. This video breaks down the mechanics behind that interaction, teaching you how to predict exactly where and how hard a wire will be pushed.
The 'motor effect' occurs because of the interaction between a wire's own magnetic field and an external one. The magnitude of this force depends on three variables: the strength of the magnetic flux density, the amount of current flowing through the wire, and the length of the wire itself. This relationship is defined by the formula F = BIl.
To visualize these invisible forces, students use Fleming's Left-hand Rule. By positioning your thumb (force), first finger (magnetic field), and second finger (current) at right angles, you can determine the direction of motion. The video also covers how the angle of the wire relative to the field affects the resulting force strength.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: GCSE Physics - Motor Effect - How to Find Force Direction & Strength (2027/28 exams)
To cite this card, link to https://intellectplus.co.uk/app/science-gcse-physics-motor-effect-how-to-find-force-direction-streng.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Physics · More in Science · Latest · A–Z · All topics
